diff --git a/datasets/movies/settings.json b/datasets/movies/settings.json
index 0edefd7d0..24007f838 100644
--- a/datasets/movies/settings.json
+++ b/datasets/movies/settings.json
@@ -1,5 +1,5 @@
 {
-    "identifier": "id",
+    "primaryKey": "id",
     "searchableAttributes": ["title", "overview"],
     "displayedAttributes": [
         "id",
diff --git a/meilisearch-core/src/database.rs b/meilisearch-core/src/database.rs
index 31fc28654..6029f54fc 100644
--- a/meilisearch-core/src/database.rs
+++ b/meilisearch-core/src/database.rs
@@ -380,7 +380,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -451,7 +451,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -521,7 +521,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -584,7 +584,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -736,7 +736,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -824,7 +824,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -971,7 +971,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
@@ -1046,7 +1046,7 @@ mod tests {
         database.set_update_callback(Box::new(update_fn));
 
         let settings_update = SettingsUpdate{
-            identifier: UpdateState::Update("id".to_string()),
+            primary_key: UpdateState::Update("id".to_string()),
             ..SettingsUpdate::default()
         };
 
diff --git a/meilisearch-core/src/error.rs b/meilisearch-core/src/error.rs
index 862c517a0..0e4cef035 100644
--- a/meilisearch-core/src/error.rs
+++ b/meilisearch-core/src/error.rs
@@ -12,7 +12,7 @@ pub type MResult<T> = Result<T, Error>;
 pub enum Error {
     Io(io::Error),
     IndexAlreadyExists,
-    MissingIdentifier,
+    MissingPrimaryKey,
     SchemaMissing,
     WordIndexMissing,
     MissingDocumentId,
@@ -87,7 +87,7 @@ impl fmt::Display for Error {
         match self {
             Io(e) => write!(f, "{}", e),
             IndexAlreadyExists => write!(f, "index already exists"),
-            MissingIdentifier => write!(f, "schema cannot be built without identifier"),
+            MissingPrimaryKey => write!(f, "schema cannot be built without primary key"),
             SchemaMissing => write!(f, "this index does not have a schema"),
             WordIndexMissing => write!(f, "this index does not have a word index"),
             MissingDocumentId => write!(f, "document id is missing"),
@@ -109,7 +109,7 @@ impl error::Error for Error {}
 #[derive(Debug)]
 pub enum UnsupportedOperation {
     SchemaAlreadyExists,
-    CannotUpdateSchemaIdentifier,
+    CannotUpdateSchemaPrimaryKey,
     CannotReorderSchemaAttribute,
     CanOnlyIntroduceNewSchemaAttributesAtEnd,
     CannotRemoveSchemaAttribute,
@@ -120,7 +120,7 @@ impl fmt::Display for UnsupportedOperation {
         use self::UnsupportedOperation::*;
         match self {
             SchemaAlreadyExists => write!(f, "Cannot update index which already have a schema"),
-            CannotUpdateSchemaIdentifier => write!(f, "Cannot update the identifier of a schema"),
+            CannotUpdateSchemaPrimaryKey => write!(f, "Cannot update the primary key of a schema"),
             CannotReorderSchemaAttribute => write!(f, "Cannot reorder the attributes of a schema"),
             CanOnlyIntroduceNewSchemaAttributesAtEnd => {
                 write!(f, "Can only introduce new attributes at end of a schema")
diff --git a/meilisearch-core/src/query_builder.rs b/meilisearch-core/src/query_builder.rs
index fe6bc3c0a..684e3b1a8 100644
--- a/meilisearch-core/src/query_builder.rs
+++ b/meilisearch-core/src/query_builder.rs
@@ -259,7 +259,7 @@ mod tests {
             let mut postings_lists = HashMap::new();
             let mut fields_counts = HashMap::<_, u16>::new();
 
-            let mut schema = Schema::with_identifier("id");
+            let mut schema = Schema::with_primary_key("id");
 
             for (word, indexes) in iter {
                 let mut final_indexes = Vec::new();
diff --git a/meilisearch-core/src/serde/extract_document_id.rs b/meilisearch-core/src/serde/extract_document_id.rs
index fab4447bd..c7303a8ec 100644
--- a/meilisearch-core/src/serde/extract_document_id.rs
+++ b/meilisearch-core/src/serde/extract_document_id.rs
@@ -8,13 +8,13 @@ use siphasher::sip::SipHasher;
 use super::{ConvertToString, SerializerError};
 
 pub fn extract_document_id<D>(
-    identifier: &str,
+    primary_key: &str,
     document: &D,
 ) -> Result<Option<DocumentId>, SerializerError>
 where
     D: serde::Serialize,
 {
-    let serializer = ExtractDocumentId { identifier };
+    let serializer = ExtractDocumentId { primary_key };
     document.serialize(serializer)
 }
 
@@ -52,7 +52,7 @@ pub fn compute_document_id<H: Hash>(t: H) -> DocumentId {
 }
 
 struct ExtractDocumentId<'a> {
-    identifier: &'a str,
+    primary_key: &'a str,
 }
 
 impl<'a> ser::Serializer for ExtractDocumentId<'a> {
@@ -188,7 +188,7 @@ impl<'a> ser::Serializer for ExtractDocumentId<'a> {
 
     fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
         let serializer = ExtractDocumentIdMapSerializer {
-            identifier: self.identifier,
+            primary_key: self.primary_key,
             document_id: None,
             current_key_name: None,
         };
@@ -202,7 +202,7 @@ impl<'a> ser::Serializer for ExtractDocumentId<'a> {
         _len: usize,
     ) -> Result<Self::SerializeStruct, Self::Error> {
         let serializer = ExtractDocumentIdStructSerializer {
-            identifier: self.identifier,
+            primary_key: self.primary_key,
             document_id: None,
         };
 
@@ -223,7 +223,7 @@ impl<'a> ser::Serializer for ExtractDocumentId<'a> {
 }
 
 pub struct ExtractDocumentIdMapSerializer<'a> {
-    identifier: &'a str,
+    primary_key: &'a str,
     document_id: Option<DocumentId>,
     current_key_name: Option<String>,
 }
@@ -260,7 +260,7 @@ impl<'a> ser::SerializeMap for ExtractDocumentIdMapSerializer<'a> {
     {
         let key = key.serialize(ConvertToString)?;
 
-        if self.identifier == key {
+        if self.primary_key == key {
             let value = serde_json::to_string(value).and_then(|s| serde_json::from_str(&s))?;
             match value_to_string(&value).map(|s| compute_document_id(&s)) {
                 Some(document_id) => self.document_id = Some(document_id),
@@ -277,7 +277,7 @@ impl<'a> ser::SerializeMap for ExtractDocumentIdMapSerializer<'a> {
 }
 
 pub struct ExtractDocumentIdStructSerializer<'a> {
-    identifier: &'a str,
+    primary_key: &'a str,
     document_id: Option<DocumentId>,
 }
 
@@ -293,7 +293,7 @@ impl<'a> ser::SerializeStruct for ExtractDocumentIdStructSerializer<'a> {
     where
         T: Serialize,
     {
-        if self.identifier == key {
+        if self.primary_key == key {
             let value = serde_json::to_string(value).and_then(|s| serde_json::from_str(&s))?;
             match value_to_string(&value).map(compute_document_id) {
                 Some(document_id) => self.document_id = Some(document_id),
diff --git a/meilisearch-core/src/serde/mod.rs b/meilisearch-core/src/serde/mod.rs
index f550728fa..2605c4035 100644
--- a/meilisearch-core/src/serde/mod.rs
+++ b/meilisearch-core/src/serde/mod.rs
@@ -57,7 +57,7 @@ impl fmt::Display for SerializerError {
                 f.write_str("serialized document does not have an id according to the schema")
             }
             SerializerError::InvalidDocumentIdType => {
-                f.write_str("documents identifiers can be of type integer or string only composed of alphanumeric characters, hyphens (-) and underscores (_).")
+                f.write_str("documents primary keys can be of type integer or string only composed of alphanumeric characters, hyphens (-) and underscores (_).")
             }
             SerializerError::Zlmdb(e) => write!(f, "heed related error: {}", e),
             SerializerError::SerdeJson(e) => write!(f, "serde json error: {}", e),
diff --git a/meilisearch-core/src/settings.rs b/meilisearch-core/src/settings.rs
index d506258cd..b9ec0fa3e 100644
--- a/meilisearch-core/src/settings.rs
+++ b/meilisearch-core/src/settings.rs
@@ -54,7 +54,7 @@ impl Settings {
         Ok(SettingsUpdate {
             ranking_rules,
             distinct_attribute: settings.distinct_attribute.into(),
-            identifier: UpdateState::Nothing,
+            primary_key: UpdateState::Nothing,
             searchable_attributes: settings.searchable_attributes.into(),
             displayed_attributes: settings.displayed_attributes.into(),
             stop_words: settings.stop_words.into(),
@@ -160,7 +160,7 @@ impl RankingRule {
 pub struct SettingsUpdate {
     pub ranking_rules: UpdateState<Vec<RankingRule>>,
     pub distinct_attribute: UpdateState<String>,
-    pub identifier: UpdateState<String>,
+    pub primary_key: UpdateState<String>,
     pub searchable_attributes: UpdateState<Vec<String>>,
     pub displayed_attributes: UpdateState<HashSet<String>>,
     pub stop_words: UpdateState<BTreeSet<String>>,
@@ -173,7 +173,7 @@ impl Default for SettingsUpdate {
         Self {
             ranking_rules: UpdateState::Nothing,
             distinct_attribute: UpdateState::Nothing,
-            identifier: UpdateState::Nothing,
+            primary_key: UpdateState::Nothing,
             searchable_attributes: UpdateState::Nothing,
             displayed_attributes: UpdateState::Nothing,
             stop_words: UpdateState::Nothing,
diff --git a/meilisearch-core/src/update/documents_addition.rs b/meilisearch-core/src/update/documents_addition.rs
index c85836694..464e330ad 100644
--- a/meilisearch-core/src/update/documents_addition.rs
+++ b/meilisearch-core/src/update/documents_addition.rs
@@ -115,11 +115,11 @@ pub fn apply_documents_addition<'a, 'b>(
         None => return Err(Error::SchemaMissing),
     };
 
-    let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
+    let primary_key = schema.primary_key().ok_or(Error::MissingPrimaryKey)?;
 
     // 1. store documents ids for future deletion
     for document in addition {
-        let document_id = match extract_document_id(&identifier, &document)? {
+        let document_id = match extract_document_id(&primary_key, &document)? {
             Some(id) => id,
             None => return Err(Error::MissingDocumentId),
         };
@@ -184,11 +184,11 @@ pub fn apply_documents_partial_addition<'a, 'b>(
         None => return Err(Error::SchemaMissing),
     };
 
-    let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
+    let primary_key = schema.primary_key().ok_or(Error::MissingPrimaryKey)?;
 
     // 1. store documents ids for future deletion
     for mut document in addition {
-        let document_id = match extract_document_id(&identifier, &document)? {
+        let document_id = match extract_document_id(&primary_key, &document)? {
             Some(id) => id,
             None => return Err(Error::MissingDocumentId),
         };
diff --git a/meilisearch-core/src/update/documents_deletion.rs b/meilisearch-core/src/update/documents_deletion.rs
index 4ae211591..f28709ad9 100644
--- a/meilisearch-core/src/update/documents_deletion.rs
+++ b/meilisearch-core/src/update/documents_deletion.rs
@@ -40,8 +40,8 @@ impl DocumentsDeletion {
     where
         D: serde::Serialize,
     {
-        let identifier = schema.identifier().ok_or(Error::MissingIdentifier)?;
-        let document_id = match extract_document_id(&identifier, &document)? {
+        let primary_key = schema.primary_key().ok_or(Error::MissingPrimaryKey)?;
+        let document_id = match extract_document_id(&primary_key, &document)? {
             Some(id) => id,
             None => return Err(Error::MissingDocumentId),
         };
diff --git a/meilisearch-core/src/update/settings_update.rs b/meilisearch-core/src/update/settings_update.rs
index 4fb6a8f47..2be2e734e 100644
--- a/meilisearch-core/src/update/settings_update.rs
+++ b/meilisearch-core/src/update/settings_update.rs
@@ -35,9 +35,9 @@ pub fn apply_settings_update(
     let mut schema = match index.main.schema(writer)? {
         Some(schema) => schema,
         None => {
-            match settings.identifier.clone() {
-                UpdateState::Update(id) => Schema::with_identifier(&id),
-                _ => return Err(Error::MissingIdentifier)
+            match settings.primary_key.clone() {
+                UpdateState::Update(id) => Schema::with_primary_key(&id),
+                _ => return Err(Error::MissingPrimaryKey)
             }
         }
     };
diff --git a/meilisearch-http/src/helpers/tide.rs b/meilisearch-http/src/helpers/tide.rs
index ce3bbe82a..979d5eaef 100644
--- a/meilisearch-http/src/helpers/tide.rs
+++ b/meilisearch-http/src/helpers/tide.rs
@@ -13,7 +13,7 @@ pub trait RequestExt {
     fn is_allowed(&self, acl: ACL) -> SResult<()>;
     fn url_param(&self, name: &str) -> SResult<String>;
     fn index(&self) -> SResult<Index>;
-    fn identifier(&self) -> SResult<String>;
+    fn document_id(&self) -> SResult<String>;
 }
 
 impl RequestExt for Request<Data> {
@@ -55,7 +55,7 @@ impl RequestExt for Request<Data> {
     fn url_param(&self, name: &str) -> SResult<String> {
         let param = self
             .param::<String>(name)
-            .map_err(|_| ResponseError::bad_parameter("identifier", name))?;
+            .map_err(|e| ResponseError::bad_parameter(name, e))?;
         Ok(param)
     }
 
@@ -69,10 +69,10 @@ impl RequestExt for Request<Data> {
         Ok(index)
     }
 
-    fn identifier(&self) -> SResult<String> {
+    fn document_id(&self) -> SResult<String> {
         let name = self
-            .param::<String>("identifier")
-            .map_err(|_| ResponseError::bad_parameter("identifier", "identifier"))?;
+            .param::<String>("documentId")
+            .map_err(|_| ResponseError::bad_parameter("documentId", "primaryKey"))?;
 
         Ok(name)
     }
diff --git a/meilisearch-http/src/routes/document.rs b/meilisearch-http/src/routes/document.rs
index df5421dfd..c80fc2509 100644
--- a/meilisearch-http/src/routes/document.rs
+++ b/meilisearch-http/src/routes/document.rs
@@ -15,18 +15,18 @@ pub async fn get_document(ctx: Request<Data>) -> SResult<Response> {
 
     let index = ctx.index()?;
 
-    let identifier = ctx.identifier()?;
-    let document_id = meilisearch_core::serde::compute_document_id(identifier.clone());
+    let original_document_id = ctx.document_id()?;
+    let document_id = meilisearch_core::serde::compute_document_id(original_document_id.clone());
 
     let db = &ctx.state().db;
     let reader = db.main_read_txn()?;
 
     let response = index
         .document::<IndexMap<String, Value>>(&reader, None, document_id)?
-        .ok_or(ResponseError::document_not_found(&identifier))?;
+        .ok_or(ResponseError::document_not_found(&original_document_id))?;
 
     if response.is_empty() {
-        return Err(ResponseError::document_not_found(identifier));
+        return Err(ResponseError::document_not_found(&original_document_id));
     }
 
     Ok(tide::Response::new(200).body_json(&response)?)
@@ -42,8 +42,8 @@ pub async fn delete_document(ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(Private)?;
 
     let index = ctx.index()?;
-    let identifier = ctx.identifier()?;
-    let document_id = meilisearch_core::serde::compute_document_id(identifier);
+    let document_id = ctx.document_id()?;
+    let document_id = meilisearch_core::serde::compute_document_id(document_id);
     let db = &ctx.state().db;
     let mut update_writer = db.update_write_txn()?;
     let mut documents_deletion = index.documents_deletion();
@@ -108,7 +108,7 @@ pub async fn get_all_documents(ctx: Request<Data>) -> SResult<Response> {
     Ok(tide::Response::new(200).body_json(&response_body)?)
 }
 
-fn find_identifier(document: &IndexMap<String, Value>) -> Option<String> {
+fn find_primary_key(document: &IndexMap<String, Value>) -> Option<String> {
     for key in document.keys() {
         if key.to_lowercase().contains("id") {
             return Some(key.to_string());
@@ -120,7 +120,7 @@ fn find_identifier(document: &IndexMap<String, Value>) -> Option<String> {
 #[derive(Default, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct UpdateDocumentsQuery {
-    identifier: Option<String>,
+    document_id: Option<String>,
 }
 
 async fn update_multiple_documents(mut ctx: Request<Data>, is_partial: bool) -> SResult<Response> {
@@ -137,16 +137,16 @@ async fn update_multiple_documents(mut ctx: Request<Data>, is_partial: bool) ->
     let reader = db.main_read_txn()?;
     let mut schema = index.main.schema(&reader)?.ok_or(ResponseError::internal("schema not found"))?;
 
-    if schema.identifier().is_none() {
-        let id = match query.identifier {
+    if schema.primary_key().is_none() {
+        let id = match query.document_id {
             Some(id) => id,
-            None => match data.first().and_then(|docs| find_identifier(docs)) {
+            None => match data.first().and_then(|docs| find_primary_key(docs)) {
                 Some(id) => id,
                 None => return Err(ResponseError::bad_request("Could not infer a schema")),
             },
         };
 
-        if schema.set_identifier(&id).is_ok() {
+        if schema.set_primary_key(&id).is_ok() {
             let mut writer = db.main_write_txn()?;
             index.main.put_schema(&mut writer, &schema)?;
             writer.commit()?;
@@ -190,10 +190,10 @@ pub async fn delete_multiple_documents(mut ctx: Request<Data>) -> SResult<Respon
 
     let mut documents_deletion = index.documents_deletion();
 
-    for identifier in data {
-        if let Some(identifier) = meilisearch_core::serde::value_to_string(&identifier) {
+    for document_id in data {
+        if let Some(document_id) = meilisearch_core::serde::value_to_string(&document_id) {
             documents_deletion
-                .delete_document_by_id(meilisearch_core::serde::compute_document_id(identifier));
+                .delete_document_by_id(meilisearch_core::serde::compute_document_id(document_id));
         }
     }
 
diff --git a/meilisearch-http/src/routes/index.rs b/meilisearch-http/src/routes/index.rs
index 924d22389..ceb179b9f 100644
--- a/meilisearch-http/src/routes/index.rs
+++ b/meilisearch-http/src/routes/index.rs
@@ -39,9 +39,9 @@ pub async fn list_indexes(ctx: Request<Data>) -> SResult<Response> {
                 let created_at = index.main.created_at(&reader)?.into_internal_error()?;
                 let updated_at = index.main.updated_at(&reader)?.into_internal_error()?;
 
-                let identifier = match index.main.schema(&reader) {
-                    Ok(Some(schema)) => match schema.identifier() {
-                        Some(identifier) => Some(identifier.to_owned()),
+                let primary_key = match index.main.schema(&reader) {
+                    Ok(Some(schema)) => match schema.primary_key() {
+                        Some(primary_key) => Some(primary_key.to_owned()),
                         None => None
                     },
                     _ => None,
@@ -52,7 +52,7 @@ pub async fn list_indexes(ctx: Request<Data>) -> SResult<Response> {
                     uid: index_uid,
                     created_at,
                     updated_at,
-                    identifier,
+                    primary_key,
                 };
                 response_body.push(index_response);
             }
@@ -73,7 +73,7 @@ struct IndexResponse {
     uid: String,
     created_at: DateTime<Utc>,
     updated_at: DateTime<Utc>,
-    identifier: Option<String>,
+    primary_key: Option<String>,
 }
 
 pub async fn get_index(ctx: Request<Data>) -> SResult<Response> {
@@ -89,9 +89,9 @@ pub async fn get_index(ctx: Request<Data>) -> SResult<Response> {
     let created_at = index.main.created_at(&reader)?.into_internal_error()?;
     let updated_at = index.main.updated_at(&reader)?.into_internal_error()?;
 
-    let identifier = match index.main.schema(&reader) {
-        Ok(Some(schema)) => match schema.identifier() {
-            Some(identifier) => Some(identifier.to_owned()),
+    let primary_key = match index.main.schema(&reader) {
+        Ok(Some(schema)) => match schema.primary_key() {
+            Some(primary_key) => Some(primary_key.to_owned()),
             None => None
         },
         _ => None,
@@ -102,7 +102,7 @@ pub async fn get_index(ctx: Request<Data>) -> SResult<Response> {
         uid,
         created_at,
         updated_at,
-        identifier,
+        primary_key,
     };
 
     Ok(tide::Response::new(200).body_json(&response_body)?)
@@ -113,7 +113,7 @@ pub async fn get_index(ctx: Request<Data>) -> SResult<Response> {
 struct IndexCreateRequest {
     name: Option<String>,
     uid: Option<String>,
-    identifier: Option<String>,
+    primary_key: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -123,7 +123,7 @@ struct IndexCreateResponse {
     uid: String,
     created_at: DateTime<Utc>,
     updated_at: DateTime<Utc>,
-    identifier: Option<String>,
+    primary_key: Option<String>,
 }
 
 pub async fn create_index(mut ctx: Request<Data>) -> SResult<Response> {
@@ -175,9 +175,9 @@ pub async fn create_index(mut ctx: Request<Data>) -> SResult<Response> {
         .updated_at(&writer)?
         .into_internal_error()?;
 
-    if let Some(id) = body.identifier.clone() {
+    if let Some(id) = body.primary_key.clone() {
         if let Some(mut schema) = created_index.main.schema(&mut writer)? {
-            if let Ok(_) = schema.set_identifier(&id) {
+            if let Ok(_) = schema.set_primary_key(&id) {
                 created_index.main.put_schema(&mut writer, &schema)?;
             }
         }
@@ -190,7 +190,7 @@ pub async fn create_index(mut ctx: Request<Data>) -> SResult<Response> {
         uid,
         created_at,
         updated_at,
-        identifier: body.identifier,
+        primary_key: body.primary_key,
     };
 
     Ok(tide::Response::new(201).body_json(&response_body)?)
@@ -200,7 +200,7 @@ pub async fn create_index(mut ctx: Request<Data>) -> SResult<Response> {
 #[serde(rename_all = "camelCase", deny_unknown_fields)]
 struct UpdateIndexRequest {
     name: Option<String>,
-    identifier: Option<String>,
+    primary_key: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -210,7 +210,7 @@ struct UpdateIndexResponse {
     uid: String,
     created_at: DateTime<Utc>,
     updated_at: DateTime<Utc>,
-    identifier: Option<String>,
+    primary_key: Option<String>,
 }
 
 pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
@@ -231,14 +231,14 @@ pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
         index.main.put_name(&mut writer, &name)?;
     }
 
-    if let Some(id) = body.identifier.clone() {
+    if let Some(id) = body.primary_key.clone() {
         if let Some(mut schema) = index.main.schema(&mut writer)? {
-            match schema.identifier() {
+            match schema.primary_key() {
                 Some(_) => {
-                    return Err(ResponseError::bad_request("The index identifier cannot be updated"));
+                    return Err(ResponseError::bad_request("The index primary key cannot be updated"));
                 },
                 None => {
-                    if let Ok(_) = schema.set_identifier(&id) {
+                    if let Ok(_) = schema.set_primary_key(&id) {
                         index.main.put_schema(&mut writer, &schema)?;
                     }
                 }
@@ -254,11 +254,11 @@ pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
     let created_at = index.main.created_at(&reader)?.into_internal_error()?;
     let updated_at = index.main.updated_at(&reader)?.into_internal_error()?;
 
-    let identifier = match index.main.schema(&reader) {
+    let primary_key = match index.main.schema(&reader) {
         Ok(Some(schema)) => {
-            match schema.identifier() {
-                Some(identifier) => {
-                    Some(identifier.to_owned())
+            match schema.primary_key() {
+                Some(primary_key) => {
+                    Some(primary_key.to_owned())
                 },
                 None => None
             }
@@ -272,7 +272,7 @@ pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
         uid: index_uid,
         created_at,
         updated_at,
-        identifier,
+        primary_key,
     };
 
     Ok(tide::Response::new(200).body_json(&response_body)?)
diff --git a/meilisearch-http/src/routes/mod.rs b/meilisearch-http/src/routes/mod.rs
index e6b914437..1d5942a08 100644
--- a/meilisearch-http/src/routes/mod.rs
+++ b/meilisearch-http/src/routes/mod.rs
@@ -61,7 +61,7 @@ pub fn load_routes(app: &mut tide::Server<Data>) {
         .put(|ctx| into_response(document::add_or_update_multiple_documents(ctx)))
         .delete(|ctx| into_response(document::clear_all_documents(ctx)));
 
-    app.at("/indexes/:index/documents/:identifier")
+    app.at("/indexes/:index/documents/:document_id")
         .get(|ctx| into_response(document::get_document(ctx)))
         .delete(|ctx| into_response(document::delete_document(ctx)));
 
diff --git a/meilisearch-http/src/routes/setting.rs b/meilisearch-http/src/routes/setting.rs
index 2aad834e4..97d0ed1b3 100644
--- a/meilisearch-http/src/routes/setting.rs
+++ b/meilisearch-http/src/routes/setting.rs
@@ -81,7 +81,7 @@ pub async fn get_all(ctx: Request<Data>) -> SResult<Response> {
 pub struct UpdateSettings {
     pub ranking_rules: Option<Vec<String>>,
     pub distinct_attribute: Option<String>,
-    pub identifier: Option<String>,
+    pub primary_key: Option<String>,
     pub searchable_attributes: Option<Vec<String>>,
     pub displayed_attributes: Option<HashSet<String>>,
     pub stop_words: Option<BTreeSet<String>>,
@@ -124,7 +124,7 @@ pub async fn delete_all(ctx: Request<Data>) -> SResult<Response> {
     let settings = SettingsUpdate {
         ranking_rules: UpdateState::Clear,
         distinct_attribute: UpdateState::Clear,
-        identifier: UpdateState::Clear,
+        primary_key: UpdateState::Clear,
         searchable_attributes: UpdateState::Clear,
         displayed_attributes: UpdateState::Clear,
         stop_words: UpdateState::Clear,
diff --git a/meilisearch-http/tests/common.rs b/meilisearch-http/tests/common.rs
index a76af5bba..9001fdce6 100644
--- a/meilisearch-http/tests/common.rs
+++ b/meilisearch-http/tests/common.rs
@@ -285,8 +285,8 @@ impl Server {
         self.delete_request_async(&url)
     }
 
-    pub fn get_identifier(&mut self) -> (Value, StatusCode) {
-        let url = format!("/indexes/{}/settings/identifier", self.uid);
+    pub fn get_primary_key(&mut self) -> (Value, StatusCode) {
+        let url = format!("/indexes/{}/settings/primary_key", self.uid);
         self.get_request(&url)
     }
 
@@ -394,7 +394,7 @@ impl Server {
     pub fn populate_movies(&mut self) {
         let body = json!({
             "uid": "movies",
-            "identifier": "id",
+            "primaryKey": "id",
         });
         self.create_index(body);
 
diff --git a/meilisearch-http/tests/index.rs b/meilisearch-http/tests/index.rs
index e376900d1..855647be9 100644
--- a/meilisearch-http/tests/index.rs
+++ b/meilisearch-http/tests/index.rs
@@ -417,14 +417,14 @@ fn create_index_failed() {
 
 // Resolve issue https://github.com/meilisearch/MeiliSearch/issues/492
 #[test]
-fn create_index_with_identifier_and_index() {
+fn create_index_with_primary_key_and_index() {
     let mut server = common::Server::with_uid("movies");
 
     // 1 - Create the index
 
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
 
     let (_response, status_code) = server.create_index(body);
@@ -512,84 +512,84 @@ fn create_index_with_invalid_uid() {
     assert_eq!(message, "Index must have a valid uid; Index uid can be of type integer or string only composed of alphanumeric characters, hyphens (-) and underscores (_).");
 }
 
-// Test that it's possible to add identifier if it's not already set on index creation
+// Test that it's possible to add primary_key if it's not already set on index creation
 #[test]
 fn create_index_and_add_indentifier_after() {
     let mut server = common::Server::with_uid("movies");
 
-    // 1 - Create the index with no identifier
+    // 1 - Create the index with no primary_key
 
     let body = json!({
         "uid": "movies",
     });
     let (response, status_code) = server.create_index(body);
     assert_eq!(status_code, 201);
-    assert_eq!(response["identifier"], json!(null));
+    assert_eq!(response["primaryKey"], json!(null));
 
-    // 2 - Update the index and add an identifier.
+    // 2 - Update the index and add an primary_key.
 
     let body = json!({
-        "identifier": "id",
+        "primaryKey": "id",
     });
 
     let (response, status_code) = server.update_index(body);
     assert_eq!(status_code, 200);
     eprintln!("response: {:#?}", response);
-    assert_eq!(response["identifier"].as_str().unwrap(), "id");
+    assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 
-    // 3 - Get index to verify if the identifier is good
+    // 3 - Get index to verify if the primary_key is good
 
     let (response, status_code) = server.get_index();
     assert_eq!(status_code, 200);
-    assert_eq!(response["identifier"].as_str().unwrap(), "id");
+    assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 
 }
 
-// Test that it's impossible to change the identifier
+// Test that it's impossible to change the primary_key
 #[test]
 fn create_index_and_update_indentifier_after() {
     let mut server = common::Server::with_uid("movies");
 
-    // 1 - Create the index with no identifier
+    // 1 - Create the index with no primary_key
 
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     let (response, status_code) = server.create_index(body);
     assert_eq!(status_code, 201);
-    assert_eq!(response["identifier"].as_str().unwrap(), "id");
+    assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 
-    // 2 - Update the index and add an identifier.
+    // 2 - Update the index and add an primary_key.
 
     let body = json!({
-        "identifier": "skuid",
+        "primaryKey": "skuid",
     });
 
     let (_response, status_code) = server.update_index(body);
     assert_eq!(status_code, 400);
 
-    // 3 - Get index to verify if the identifier still the first one
+    // 3 - Get index to verify if the primary_key still the first one
 
     let (response, status_code) = server.get_index();
     assert_eq!(status_code, 200);
-    assert_eq!(response["identifier"].as_str().unwrap(), "id");
+    assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 }
 
 
 // Test that schema inference work well
 #[test]
-fn create_index_without_identifier_and_add_document() {
+fn create_index_without_primary_key_and_add_document() {
     let mut server = common::Server::with_uid("movies");
 
-    // 1 - Create the index with no identifier
+    // 1 - Create the index with no primary_key
 
     let body = json!({
         "uid": "movies",
     });
     let (response, status_code) = server.create_index(body);
     assert_eq!(status_code, 201);
-    assert_eq!(response["identifier"], json!(null));
+    assert_eq!(response["primaryKey"], json!(null));
 
     // 2 - Add a document
 
@@ -600,27 +600,27 @@ fn create_index_without_identifier_and_add_document() {
 
     server.add_or_update_multiple_documents(body);
 
-    // 3 - Get index to verify if the identifier is good
+    // 3 - Get index to verify if the primary_key is good
 
     let (response, status_code) = server.get_index();
     assert_eq!(status_code, 200);
-    assert_eq!(response["identifier"].as_str().unwrap(), "id");
+    assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 }
 
 
-// Test search with no identifier
+// Test search with no primary_key
 #[test]
-fn create_index_without_identifier_and_search() {
+fn create_index_without_primary_key_and_search() {
     let mut server = common::Server::with_uid("movies");
 
-    // 1 - Create the index with no identifier
+    // 1 - Create the index with no primary_key
 
     let body = json!({
         "uid": "movies",
     });
     let (response, status_code) = server.create_index(body);
     assert_eq!(status_code, 201);
-    assert_eq!(response["identifier"], json!(null));
+    assert_eq!(response["primaryKey"], json!(null));
 
     // 2 - Search
 
diff --git a/meilisearch-http/tests/search.rs b/meilisearch-http/tests/search.rs
index ddda3d24a..3823fd769 100644
--- a/meilisearch-http/tests/search.rs
+++ b/meilisearch-http/tests/search.rs
@@ -644,7 +644,7 @@ fn search_with_settings_basic() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -751,7 +751,7 @@ fn search_with_settings_stop_words() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -858,7 +858,7 @@ fn search_with_settings_synonyms() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -970,7 +970,7 @@ fn search_with_settings_ranking_rules() {
         "desc(popularity)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -1077,7 +1077,7 @@ fn search_with_settings_searchable_attributes() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "tagline",
         "overview",
@@ -1183,7 +1183,7 @@ fn search_with_settings_displayed_attributes() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -1254,7 +1254,7 @@ fn search_with_settings_searchable_attributes_2() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "identifier": "id",
+      "primaryKey": "id",
       "searchableAttributes": [
         "tagline",
         "overview",
diff --git a/meilisearch-http/tests/settings.rs b/meilisearch-http/tests/settings.rs
index fc8af7c89..1e28f163f 100644
--- a/meilisearch-http/tests/settings.rs
+++ b/meilisearch-http/tests/settings.rs
@@ -291,7 +291,7 @@ fn test_default_settings_2() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
diff --git a/meilisearch-http/tests/settings_accept_new_fields.rs b/meilisearch-http/tests/settings_accept_new_fields.rs
index 6157e7cb5..5d11b3fe9 100644
--- a/meilisearch-http/tests/settings_accept_new_fields.rs
+++ b/meilisearch-http/tests/settings_accept_new_fields.rs
@@ -8,7 +8,7 @@ fn index_new_fields_default() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
@@ -60,7 +60,7 @@ fn index_new_fields_true() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
@@ -116,7 +116,7 @@ fn index_new_fields_false() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
@@ -169,7 +169,7 @@ fn index_new_fields_true_then_false() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
@@ -228,7 +228,7 @@ fn index_new_fields_false_then_true() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
diff --git a/meilisearch-http/tests/settings_ranking_rules.rs b/meilisearch-http/tests/settings_ranking_rules.rs
index 908dd9c31..cc8d3e422 100644
--- a/meilisearch-http/tests/settings_ranking_rules.rs
+++ b/meilisearch-http/tests/settings_ranking_rules.rs
@@ -111,7 +111,7 @@ fn send_undefined_rule() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
@@ -128,7 +128,7 @@ fn send_malformed_custom_rule() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
diff --git a/meilisearch-http/tests/settings_stop_words.rs b/meilisearch-http/tests/settings_stop_words.rs
index 195a2d69e..5ee250dd5 100644
--- a/meilisearch-http/tests/settings_stop_words.rs
+++ b/meilisearch-http/tests/settings_stop_words.rs
@@ -8,7 +8,7 @@ fn update_stop_words() {
     let mut server = common::Server::with_uid("movies");
     let body = json!({
         "uid": "movies",
-        "identifier": "id",
+        "primaryKey": "id",
     });
     server.create_index(body);
 
diff --git a/meilisearch-schema/src/error.rs b/meilisearch-schema/src/error.rs
index 839ad1816..c31596df2 100644
--- a/meilisearch-schema/src/error.rs
+++ b/meilisearch-schema/src/error.rs
@@ -6,7 +6,7 @@ pub type SResult<T> = Result<T, Error>;
 #[derive(Debug)]
 pub enum Error {
     FieldNameNotFound(String),
-    IdentifierAlreadyPresent,
+    PrimaryKeyAlreadyPresent,
     MaxFieldsLimitExceeded,
 }
 
@@ -15,7 +15,7 @@ impl fmt::Display for Error {
         use self::Error::*;
         match self {
             FieldNameNotFound(field) => write!(f, "The field {:?} doesn't exist", field),
-            IdentifierAlreadyPresent => write!(f, "The schema already have an identifier. It's impossible to update it"),
+            PrimaryKeyAlreadyPresent => write!(f, "The schema already have an primary key. It's impossible to update it"),
             MaxFieldsLimitExceeded => write!(f, "The maximum of possible reattributed field id has been reached"),
         }
     }
diff --git a/meilisearch-schema/src/schema.rs b/meilisearch-schema/src/schema.rs
index 79e2d3fad..b1b8bc66b 100644
--- a/meilisearch-schema/src/schema.rs
+++ b/meilisearch-schema/src/schema.rs
@@ -6,7 +6,7 @@ use std::collections::{HashMap, HashSet};
 pub struct Schema {
     fields_map: FieldsMap,
 
-    identifier: Option<FieldId>,
+    primary_key: Option<FieldId>,
     ranked: HashSet<FieldId>,
     displayed: HashSet<FieldId>,
 
@@ -20,7 +20,7 @@ impl Schema {
     pub fn new() -> Schema {
         Schema {
             fields_map: FieldsMap::default(),
-            identifier: None,
+            primary_key: None,
             ranked: HashSet::new(),
             displayed: HashSet::new(),
             indexed: Vec::new(),
@@ -29,7 +29,7 @@ impl Schema {
         }
     }
 
-    pub fn with_identifier(name: &str) -> Schema {
+    pub fn with_primary_key(name: &str) -> Schema {
         let mut fields_map = FieldsMap::default();
         let field_id = fields_map.insert(name).unwrap();
 
@@ -43,7 +43,7 @@ impl Schema {
 
         Schema {
             fields_map,
-            identifier: Some(field_id),
+            primary_key: Some(field_id),
             ranked: HashSet::new(),
             displayed,
             indexed,
@@ -52,17 +52,17 @@ impl Schema {
         }
     }
 
-    pub fn identifier(&self) -> Option<&str> {
-        self.identifier.map(|id| self.fields_map.name(id).unwrap())
+    pub fn primary_key(&self) -> Option<&str> {
+        self.primary_key.map(|id| self.fields_map.name(id).unwrap())
     }
 
-    pub fn set_identifier(&mut self, name: &str) -> SResult<FieldId> {
-        if self.identifier.is_some() {
-            return Err(Error::IdentifierAlreadyPresent)
+    pub fn set_primary_key(&mut self, name: &str) -> SResult<FieldId> {
+        if self.primary_key.is_some() {
+            return Err(Error::PrimaryKeyAlreadyPresent)
         }
 
         let id = self.insert(name)?;
-        self.identifier = Some(id);
+        self.primary_key = Some(id);
         self.set_indexed(name)?;
         self.set_displayed(name)?;