diff --git a/meilisearch-core/src/database.rs b/meilisearch-core/src/database.rs
index 6029f54fc..09daf4864 100644
--- a/meilisearch-core/src/database.rs
+++ b/meilisearch-core/src/database.rs
@@ -359,7 +359,7 @@ mod tests {
 
     use crate::criterion::{self, CriteriaBuilder};
     use crate::update::{ProcessedUpdateResult, UpdateStatus};
-    use crate::settings::{Settings, SettingsUpdate, UpdateState};
+    use crate::settings::Settings;
     use crate::{Document, DocumentId};
     use serde::de::IgnoredAny;
     use std::sync::mpsc;
@@ -379,17 +379,11 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
         // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
 
         let settings = {
             let data = r#"
@@ -450,18 +444,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -520,18 +506,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -583,18 +561,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -735,18 +705,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -823,18 +785,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -970,18 +924,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
@@ -1045,18 +991,10 @@ mod tests {
 
         database.set_update_callback(Box::new(update_fn));
 
-        let settings_update = SettingsUpdate{
-            primary_key: UpdateState::Update("id".to_string()),
-            ..SettingsUpdate::default()
-        };
-
-        let mut writer = db.update_write_txn().unwrap();
-        let update_id = index.settings_update(&mut writer, settings_update).unwrap();
+        let mut writer = db.main_write_txn().unwrap();
+        index.main.put_schema(&mut writer, &Schema::with_primary_key("id")).unwrap();
         writer.commit().unwrap();
 
-        // block until the transaction is processed
-        let _ = receiver.iter().find(|id| *id == update_id);
-
         let settings = {
             let data = r#"
                 {
diff --git a/meilisearch-http/src/routes/document.rs b/meilisearch-http/src/routes/document.rs
index c80fc2509..1eb7b66c1 100644
--- a/meilisearch-http/src/routes/document.rs
+++ b/meilisearch-http/src/routes/document.rs
@@ -135,7 +135,10 @@ async fn update_multiple_documents(mut ctx: Request<Data>, is_partial: bool) ->
     let db = &ctx.state().db;
 
     let reader = db.main_read_txn()?;
-    let mut schema = index.main.schema(&reader)?.ok_or(ResponseError::internal("schema not found"))?;
+    let mut schema = index
+        .main
+        .schema(&reader)?
+        .ok_or(ResponseError::internal("schema not found"))?;
 
     if schema.primary_key().is_none() {
         let id = match query.document_id {
diff --git a/meilisearch-http/src/routes/index.rs b/meilisearch-http/src/routes/index.rs
index ceb179b9f..a4b11f049 100644
--- a/meilisearch-http/src/routes/index.rs
+++ b/meilisearch-http/src/routes/index.rs
@@ -42,7 +42,7 @@ pub async fn list_indexes(ctx: Request<Data>) -> SResult<Response> {
                 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 => None,
                     },
                     _ => None,
                 };
@@ -92,7 +92,7 @@ pub async fn get_index(ctx: Request<Data>) -> SResult<Response> {
     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 => None,
         },
         _ => None,
     };
@@ -144,12 +144,15 @@ pub async fn create_index(mut ctx: Request<Data>) -> SResult<Response> {
 
     let uid = match body.uid {
         Some(uid) => {
-            if uid.chars().all(|x| x.is_ascii_alphanumeric() || x == '-' || x == '_') {
+            if uid
+                .chars()
+                .all(|x| x.is_ascii_alphanumeric() || x == '-' || x == '_')
+            {
                 uid
             } else {
-                return Err(ResponseError::InvalidIndexUid)
+                return Err(ResponseError::InvalidIndexUid);
             }
-        },
+        }
         None => loop {
             let uid = generate_uid();
             if db.open_index(&uid).is_none() {
@@ -235,8 +238,10 @@ pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
         if let Some(mut schema) = index.main.schema(&mut writer)? {
             match schema.primary_key() {
                 Some(_) => {
-                    return Err(ResponseError::bad_request("The index primary key cannot be updated"));
-                },
+                    return Err(ResponseError::bad_request(
+                        "The index primary key cannot be updated",
+                    ));
+                }
                 None => {
                     if let Ok(_) = schema.set_primary_key(&id) {
                         index.main.put_schema(&mut writer, &schema)?;
@@ -255,14 +260,9 @@ pub async fn update_index(mut ctx: Request<Data>) -> SResult<Response> {
     let updated_at = index.main.updated_at(&reader)?.into_internal_error()?;
 
     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
-            }
-
+        Ok(Some(schema)) => match schema.primary_key() {
+            Some(primary_key) => Some(primary_key.to_owned()),
+            None => None,
         },
         _ => None,
     };
diff --git a/meilisearch-http/tests/common.rs b/meilisearch-http/tests/common.rs
index 9001fdce6..eee0fc283 100644
--- a/meilisearch-http/tests/common.rs
+++ b/meilisearch-http/tests/common.rs
@@ -69,9 +69,7 @@ impl Server {
 
     fn get_request(&mut self, url: &str) -> (Value, StatusCode) {
         eprintln!("get_request: {}", url);
-        let req = http::Request::get(url)
-            .body(Body::empty())
-            .unwrap();
+        let req = http::Request::get(url).body(Body::empty()).unwrap();
         let res = self.mock.simulate(req).unwrap();
         let status_code = res.status().clone();
 
@@ -97,7 +95,7 @@ impl Server {
         (response, status_code)
     }
 
-    fn post_request_async(&mut self, url: &str, body: Value)  -> (Value, StatusCode) {
+    fn post_request_async(&mut self, url: &str, body: Value) -> (Value, StatusCode) {
         eprintln!("post_request_async: {}", url);
         let (response, status_code) = self.post_request(url, body);
         assert_eq!(status_code, 202);
@@ -133,9 +131,7 @@ impl Server {
 
     fn delete_request(&mut self, url: &str) -> (Value, StatusCode) {
         eprintln!("delete_request: {}", url);
-        let req = http::Request::delete(url)
-            .body(Body::empty())
-            .unwrap();
+        let req = http::Request::delete(url).body(Body::empty()).unwrap();
         let res = self.mock.simulate(req).unwrap();
         let status_code = res.status().clone();
 
@@ -154,7 +150,6 @@ impl Server {
         (response, status_code)
     }
 
-
     // // All Routes
 
     pub fn list_indexes(&mut self) -> (Value, StatusCode) {
@@ -221,12 +216,20 @@ impl Server {
     }
 
     pub fn get_document(&mut self, document_id: impl ToString) -> (Value, StatusCode) {
-        let url = format!("/indexes/{}/documents/{}", self.uid, document_id.to_string());
+        let url = format!(
+            "/indexes/{}/documents/{}",
+            self.uid,
+            document_id.to_string()
+        );
         self.get_request(&url)
     }
 
     pub fn delete_document(&mut self, document_id: impl ToString) -> (Value, StatusCode) {
-        let url = format!("/indexes/{}/documents/{}", self.uid, document_id.to_string());
+        let url = format!(
+            "/indexes/{}/documents/{}",
+            self.uid,
+            document_id.to_string()
+        );
         self.delete_request_async(&url)
     }
 
@@ -443,5 +446,4 @@ impl Server {
 
         self.add_or_replace_multiple_documents(body);
     }
-
 }
diff --git a/meilisearch-http/tests/documents_delete.rs b/meilisearch-http/tests/documents_delete.rs
index 35041e023..0773702ca 100644
--- a/meilisearch-http/tests/documents_delete.rs
+++ b/meilisearch-http/tests/documents_delete.rs
@@ -14,7 +14,6 @@ fn delete() {
     assert_eq!(status_code, 404);
 }
 
-
 // Resolve teh issue https://github.com/meilisearch/MeiliSearch/issues/493
 #[test]
 fn delete_batch() {
@@ -24,7 +23,7 @@ fn delete_batch() {
     let (_response, status_code) = server.get_document(419704);
     assert_eq!(status_code, 200);
 
-    let body = serde_json::json!([419704,512200,181812]);
+    let body = serde_json::json!([419704, 512200, 181812]);
     server.delete_multiple_documents(body);
 
     let (_response, status_code) = server.get_document(419704);
diff --git a/meilisearch-http/tests/index.rs b/meilisearch-http/tests/index.rs
index 855647be9..849cc425d 100644
--- a/meilisearch-http/tests/index.rs
+++ b/meilisearch-http/tests/index.rs
@@ -1,5 +1,5 @@
-use serde_json::json;
 use assert_json_diff::assert_json_eq;
+use serde_json::json;
 
 mod common;
 
@@ -413,8 +413,6 @@ fn create_index_failed() {
     assert_eq!(message, "invalid data");
 }
 
-
-
 // Resolve issue https://github.com/meilisearch/MeiliSearch/issues/492
 #[test]
 fn create_index_with_primary_key_and_index() {
@@ -542,7 +540,6 @@ fn create_index_and_add_indentifier_after() {
     let (response, status_code) = server.get_index();
     assert_eq!(status_code, 200);
     assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
-
 }
 
 // Test that it's impossible to change the primary_key
@@ -576,7 +573,6 @@ fn create_index_and_update_indentifier_after() {
     assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 }
 
-
 // Test that schema inference work well
 #[test]
 fn create_index_without_primary_key_and_add_document() {
@@ -607,7 +603,6 @@ fn create_index_without_primary_key_and_add_document() {
     assert_eq!(response["primaryKey"].as_str().unwrap(), "id");
 }
 
-
 // Test search with no primary_key
 #[test]
 fn create_index_without_primary_key_and_search() {
diff --git a/meilisearch-http/tests/search.rs b/meilisearch-http/tests/search.rs
index 3823fd769..a53aecf89 100644
--- a/meilisearch-http/tests/search.rs
+++ b/meilisearch-http/tests/search.rs
@@ -1,6 +1,6 @@
-use std::convert::Into;
-use serde_json::json;
 use assert_json_diff::assert_json_eq;
+use serde_json::json;
+use std::convert::Into;
 
 mod common;
 
diff --git a/meilisearch-http/tests/settings.rs b/meilisearch-http/tests/settings.rs
index 1e28f163f..c692e4104 100644
--- a/meilisearch-http/tests/settings.rs
+++ b/meilisearch-http/tests/settings.rs
@@ -1,6 +1,6 @@
-use std::convert::Into;
 use assert_json_diff::assert_json_eq;
 use serde_json::json;
+use std::convert::Into;
 
 mod common;
 
@@ -253,7 +253,6 @@ fn write_all_and_update() {
     assert_json_eq!(expected, response, ordered: false);
 }
 
-
 #[test]
 fn test_default_settings() {
     let mut server = common::Server::with_uid("movies");
diff --git a/meilisearch-http/tests/settings_ranking_rules.rs b/meilisearch-http/tests/settings_ranking_rules.rs
index cc8d3e422..a393374ee 100644
--- a/meilisearch-http/tests/settings_ranking_rules.rs
+++ b/meilisearch-http/tests/settings_ranking_rules.rs
@@ -115,9 +115,7 @@ fn send_undefined_rule() {
     });
     server.create_index(body);
 
-    let body = json!([
-        "typos",
-    ]);
+    let body = json!(["typos",]);
 
     let (_response, status_code) = server.update_ranking_rules_sync(body);
     assert_eq!(status_code, 400);
@@ -132,9 +130,7 @@ fn send_malformed_custom_rule() {
     });
     server.create_index(body);
 
-    let body = json!([
-        "dsc(truc)",
-    ]);
+    let body = json!(["dsc(truc)",]);
 
     let (_response, status_code) = server.update_ranking_rules_sync(body);
     assert_eq!(status_code, 400);
diff --git a/meilisearch-http/tests/settings_stop_words.rs b/meilisearch-http/tests/settings_stop_words.rs
index 5ee250dd5..0c9257150 100644
--- a/meilisearch-http/tests/settings_stop_words.rs
+++ b/meilisearch-http/tests/settings_stop_words.rs
@@ -19,10 +19,7 @@ fn update_stop_words() {
 
     // 2 - Update stop words
 
-    let body = json!([
-        "the",
-        "a"
-    ]);
+    let body = json!(["the", "a"]);
     server.update_stop_words(body.clone());
 
     // 3 - Get all stop words and compare to the previous one