diff --git a/milli/src/error.rs b/milli/src/error.rs
index 539861e73..d0a4d35ef 100644
--- a/milli/src/error.rs
+++ b/milli/src/error.rs
@@ -172,7 +172,7 @@ only composed of alphanumeric characters (a-z A-Z 0-9), hyphens (-) and undersco
     TooManyDocumentIds { primary_key: String, document: Object },
     #[error("The primary key inference failed as the engine did not find any field ending with `id` in its name. Please specify the primary key manually using the `primaryKey` query parameter.")]
     NoPrimaryKeyCandidateFound,
-    #[error("The primary key inference failed as the engine found {} fields ending with `id` in their names: '{}' and '{}'. Please specify the primary key manually using the `primaryKey` query parameter.", .candidates.len(), .candidates.get(0).unwrap(), .candidates.get(1).unwrap())]
+    #[error("The primary key inference failed as the engine found {} fields ending with `id` in their names: '{}' and '{}'. Please specify the primary key manually using the `primaryKey` query parameter.", .candidates.len(), .candidates.first().unwrap(), .candidates.get(1).unwrap())]
     MultiplePrimaryKeyCandidatesFound { candidates: Vec<String> },
     #[error("There is no more space left on the device. Consider increasing the size of the disk/partition.")]
     NoSpaceLeftOnDevice,
diff --git a/milli/src/search/facet/facet_sort_ascending.rs b/milli/src/search/facet/facet_sort_ascending.rs
index 20c277c63..07fe64510 100644
--- a/milli/src/search/facet/facet_sort_ascending.rs
+++ b/milli/src/search/facet/facet_sort_ascending.rs
@@ -181,7 +181,7 @@ mod tests {
             get_simple_string_index_with_multiple_field_ids(),
             get_random_looking_string_index_with_multiple_field_ids(),
         ];
-        for (_i, index) in indexes.iter().enumerate() {
+        for index in indexes {
             let txn = index.env.read_txn().unwrap();
             let candidates = RoaringBitmap::new();
             let mut results = String::new();
@@ -212,7 +212,7 @@ mod tests {
             get_simple_string_index_with_multiple_field_ids(),
             get_random_looking_string_index_with_multiple_field_ids(),
         ];
-        for (_i, index) in indexes.iter().enumerate() {
+        for index in indexes {
             let txn = index.env.read_txn().unwrap();
             let candidates = RoaringBitmap::new();
             let mut results = String::new();
diff --git a/milli/src/search/facet/facet_sort_descending.rs b/milli/src/search/facet/facet_sort_descending.rs
index ae6eb60d0..dd2692012 100644
--- a/milli/src/search/facet/facet_sort_descending.rs
+++ b/milli/src/search/facet/facet_sort_descending.rs
@@ -195,7 +195,7 @@ mod tests {
             get_simple_string_index_with_multiple_field_ids(),
             get_random_looking_string_index_with_multiple_field_ids(),
         ];
-        for (_i, index) in indexes.iter().enumerate() {
+        for index in indexes {
             let txn = index.env.read_txn().unwrap();
             let candidates = RoaringBitmap::new();
             let mut results = String::new();
@@ -226,7 +226,7 @@ mod tests {
             get_simple_string_index_with_multiple_field_ids(),
             get_random_looking_string_index_with_multiple_field_ids(),
         ];
-        for (_i, index) in indexes.iter().enumerate() {
+        for index in indexes {
             let txn = index.env.read_txn().unwrap();
             let candidates = RoaringBitmap::new();
             let mut results = String::new();
diff --git a/milli/src/search/facet/mod.rs b/milli/src/search/facet/mod.rs
index f44d6a153..f676ee109 100644
--- a/milli/src/search/facet/mod.rs
+++ b/milli/src/search/facet/mod.rs
@@ -142,7 +142,7 @@ pub(crate) mod tests {
         let mut txn = index.env.write_txn().unwrap();
         let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
 
-        for (_i, key) in std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).enumerate() {
+        for key in std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128) {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(key);
             bitmap.insert(key + 100);
@@ -172,7 +172,7 @@ pub(crate) mod tests {
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
         for fid in 0..2 {
-            for (_i, &key) in keys.iter().enumerate() {
+            for &key in &keys {
                 let mut bitmap = RoaringBitmap::new();
                 bitmap.insert(key);
                 bitmap.insert(key + 100);
@@ -207,7 +207,7 @@ pub(crate) mod tests {
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
         for fid in 0..2 {
-            for (_i, &key) in keys.iter().enumerate() {
+            for &key in &keys {
                 let mut bitmap = RoaringBitmap::new();
                 bitmap.insert(key);
                 bitmap.insert(key + 100);
diff --git a/milli/src/update/facet/incremental.rs b/milli/src/update/facet/incremental.rs
index 9d8ee08f4..78db218e3 100644
--- a/milli/src/update/facet/incremental.rs
+++ b/milli/src/update/facet/incremental.rs
@@ -751,7 +751,7 @@ mod tests {
         let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         keys.shuffle(&mut rng);
 
-        for (_i, key) in keys.into_iter().enumerate() {
+        for key in keys {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(key);
             index.insert(&mut txn, 0, &(key as f64), &bitmap);
@@ -770,7 +770,7 @@ mod tests {
         let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         keys.shuffle(&mut rng);
 
-        for (_i, key) in keys.into_iter().enumerate() {
+        for key in keys {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(key);
             bitmap.insert(rng.gen_range(256..512));
diff --git a/milli/src/update/index_documents/extract/extract_word_pair_proximity_docids.rs b/milli/src/update/index_documents/extract/extract_word_pair_proximity_docids.rs
index b8a377247..d364b3e13 100644
--- a/milli/src/update/index_documents/extract/extract_word_pair_proximity_docids.rs
+++ b/milli/src/update/index_documents/extract/extract_word_pair_proximity_docids.rs
@@ -77,7 +77,7 @@ pub fn extract_word_pair_proximity_docids<R: io::Read + io::Seek>(
                 if let Some(deletion) = KvReaderDelAdd::new(value).get(DelAdd::Deletion) {
                     for (position, word) in KvReaderU16::new(deletion).iter() {
                         // drain the proximity window until the head word is considered close to the word we are inserting.
-                        while del_word_positions.get(0).map_or(false, |(_w, p)| {
+                        while del_word_positions.front().map_or(false, |(_w, p)| {
                             index_proximity(*p as u32, position as u32) >= MAX_DISTANCE
                         }) {
                             word_positions_into_word_pair_proximity(
@@ -106,7 +106,7 @@ pub fn extract_word_pair_proximity_docids<R: io::Read + io::Seek>(
                 if let Some(addition) = KvReaderDelAdd::new(value).get(DelAdd::Addition) {
                     for (position, word) in KvReaderU16::new(addition).iter() {
                         // drain the proximity window until the head word is considered close to the word we are inserting.
-                        while add_word_positions.get(0).map_or(false, |(_w, p)| {
+                        while add_word_positions.front().map_or(false, |(_w, p)| {
                             index_proximity(*p as u32, position as u32) >= MAX_DISTANCE
                         }) {
                             word_positions_into_word_pair_proximity(