diff --git a/file-store/src/lib.rs b/file-store/src/lib.rs
index e3851a2df..15c4168bc 100644
--- a/file-store/src/lib.rs
+++ b/file-store/src/lib.rs
@@ -1,5 +1,5 @@
 use std::fs::File as StdFile;
-use std::ops::{Deref, DerefMut};
+use std::io::Write;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 
@@ -22,20 +22,6 @@ pub enum Error {
 
 pub type Result<T> = std::result::Result<T, Error>;
 
-impl Deref for File {
-    type Target = NamedTempFile;
-
-    fn deref(&self) -> &Self::Target {
-        &self.file
-    }
-}
-
-impl DerefMut for File {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.file
-    }
-}
-
 #[derive(Clone, Debug)]
 pub struct FileStore {
     path: PathBuf,
@@ -56,7 +42,7 @@ impl FileStore {
         let file = NamedTempFile::new_in(&self.path)?;
         let uuid = Uuid::new_v4();
         let path = self.path.join(uuid.to_string());
-        let update_file = File { dry: false, file, path };
+        let update_file = File { file: Some(file), path };
 
         Ok((uuid, update_file))
     }
@@ -67,7 +53,7 @@ impl FileStore {
         let file = NamedTempFile::new_in(&self.path)?;
         let uuid = Uuid::from_u128(uuid);
         let path = self.path.join(uuid.to_string());
-        let update_file = File { dry: false, file, path };
+        let update_file = File { file: Some(file), path };
 
         Ok((uuid, update_file))
     }
@@ -135,33 +121,41 @@ impl FileStore {
 }
 
 pub struct File {
-    dry: bool,
     path: PathBuf,
-    file: NamedTempFile,
+    file: Option<NamedTempFile>,
 }
 
 impl File {
     pub fn dry_file() -> Result<Self> {
-        #[cfg(target_family = "unix")]
-        let path = PathBuf::from_str("/dev/null").unwrap();
-        #[cfg(target_family = "windows")]
-        let path = PathBuf::from_str("\\Device\\Null").unwrap();
-
-        Ok(Self {
-            dry: true,
-            path: path.clone(),
-            file: tempfile::Builder::new().make(|_| std::fs::File::create(path.clone()))?,
-        })
+        Ok(Self { path: PathBuf::new(), file: None })
     }
 
     pub fn persist(self) -> Result<()> {
-        if !self.dry {
-            self.file.persist(&self.path)?;
+        if let Some(file) = self.file {
+            file.persist(&self.path)?;
         }
         Ok(())
     }
 }
 
+impl Write for File {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        if let Some(file) = self.file.as_mut() {
+            file.write(buf)
+        } else {
+            Ok(buf.len())
+        }
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        if let Some(file) = self.file.as_mut() {
+            file.flush()
+        } else {
+            Ok(())
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use std::io::Write;
diff --git a/index-scheduler/src/lib.rs b/index-scheduler/src/lib.rs
index 5d0ce9eb9..1c3b93bce 100644
--- a/index-scheduler/src/lib.rs
+++ b/index-scheduler/src/lib.rs
@@ -1550,7 +1550,7 @@ impl<'a> Dump<'a> {
         let content_uuid = match content_file {
             Some(content_file) if task.status == Status::Enqueued => {
                 let (uuid, mut file) = self.index_scheduler.create_update_file(false)?;
-                let mut builder = DocumentsBatchBuilder::new(file.as_file_mut());
+                let mut builder = DocumentsBatchBuilder::new(&mut file);
                 for doc in content_file {
                     builder.append_json_object(&doc?)?;
                 }
@@ -1734,7 +1734,7 @@ pub struct IndexStats {
 
 #[cfg(test)]
 mod tests {
-    use std::io::{BufWriter, Seek, Write};
+    use std::io::{BufWriter, Write};
     use std::time::Instant;
 
     use big_s::S;
@@ -1882,7 +1882,7 @@ mod tests {
     /// Adapting to the new json reading interface
     pub fn read_json(
         bytes: &[u8],
-        write: impl Write + Seek,
+        write: impl Write,
     ) -> std::result::Result<u64, DocumentFormatError> {
         let temp_file = NamedTempFile::new().unwrap();
         let mut buffer = BufWriter::new(temp_file.reopen().unwrap());
@@ -1909,7 +1909,7 @@ mod tests {
         );
 
         let (_uuid, mut file) = index_scheduler.create_update_file_with_uuid(file_uuid).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         (file, documents_count)
     }
 
@@ -2321,7 +2321,7 @@ mod tests {
         }"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -2366,7 +2366,7 @@ mod tests {
         snapshot!(snapshot_index_scheduler(&index_scheduler), name: "registered_the_first_task");
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -2406,7 +2406,7 @@ mod tests {
         ]"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -2472,7 +2472,7 @@ mod tests {
         ]"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -2678,7 +2678,7 @@ mod tests {
         }"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -2852,7 +2852,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -2903,7 +2903,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -2956,7 +2956,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3010,7 +3010,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3065,7 +3065,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3567,7 +3567,7 @@ mod tests {
         }"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -3609,7 +3609,7 @@ mod tests {
         }"#;
 
         let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(0).unwrap();
-        let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+        let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
         file.persist().unwrap();
         index_scheduler
             .register(
@@ -3669,7 +3669,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3721,7 +3721,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3783,7 +3783,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3850,7 +3850,7 @@ mod tests {
             );
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3922,7 +3922,7 @@ mod tests {
             let allow_index_creation = i % 2 != 0;
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -3979,7 +3979,7 @@ mod tests {
             let allow_index_creation = i % 2 != 0;
 
             let (uuid, mut file) = index_scheduler.create_update_file_with_uuid(i).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             file.persist().unwrap();
             index_scheduler
                 .register(
@@ -4033,7 +4033,7 @@ mod tests {
             );
             let (uuid, mut file) =
                 index_scheduler.create_update_file_with_uuid(id as u128).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             assert_eq!(documents_count, 1);
             file.persist().unwrap();
 
@@ -4098,7 +4098,7 @@ mod tests {
             );
             let (uuid, mut file) =
                 index_scheduler.create_update_file_with_uuid(id as u128).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             assert_eq!(documents_count, 1);
             file.persist().unwrap();
 
@@ -4159,7 +4159,7 @@ mod tests {
             );
             let (uuid, mut file) =
                 index_scheduler.create_update_file_with_uuid(id as u128).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             assert_eq!(documents_count, 1);
             file.persist().unwrap();
 
@@ -4244,7 +4244,7 @@ mod tests {
             );
             let (uuid, mut file) =
                 index_scheduler.create_update_file_with_uuid(id as u128).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             assert_eq!(documents_count, 1);
             file.persist().unwrap();
 
@@ -4331,7 +4331,7 @@ mod tests {
             );
             let (uuid, mut file) =
                 index_scheduler.create_update_file_with_uuid(id as u128).unwrap();
-            let documents_count = read_json(content.as_bytes(), file.as_file_mut()).unwrap();
+            let documents_count = read_json(content.as_bytes(), &mut file).unwrap();
             assert_eq!(documents_count, 1);
             file.persist().unwrap();
 
diff --git a/meilisearch-types/src/document_formats.rs b/meilisearch-types/src/document_formats.rs
index 0f1d995f9..50dc5bad4 100644
--- a/meilisearch-types/src/document_formats.rs
+++ b/meilisearch-types/src/document_formats.rs
@@ -1,6 +1,6 @@
 use std::fmt::{self, Debug, Display};
 use std::fs::File;
-use std::io::{self, Seek, Write};
+use std::io::{self, BufWriter, Write};
 use std::marker::PhantomData;
 
 use memmap2::MmapOptions;
@@ -104,8 +104,8 @@ impl ErrorCode for DocumentFormatError {
 }
 
 /// Reads CSV from input and write an obkv batch to writer.
-pub fn read_csv(file: &File, writer: impl Write + Seek, delimiter: u8) -> Result<u64> {
-    let mut builder = DocumentsBatchBuilder::new(writer);
+pub fn read_csv(file: &File, writer: impl Write, delimiter: u8) -> Result<u64> {
+    let mut builder = DocumentsBatchBuilder::new(BufWriter::new(writer));
     let mmap = unsafe { MmapOptions::new().map(file)? };
     let csv = csv::ReaderBuilder::new().delimiter(delimiter).from_reader(mmap.as_ref());
     builder.append_csv(csv).map_err(|e| (PayloadType::Csv { delimiter }, e))?;
@@ -116,9 +116,9 @@ pub fn read_csv(file: &File, writer: impl Write + Seek, delimiter: u8) -> Result
     Ok(count as u64)
 }
 
-/// Reads JSON from temporary file  and write an obkv batch to writer.
-pub fn read_json(file: &File, writer: impl Write + Seek) -> Result<u64> {
-    let mut builder = DocumentsBatchBuilder::new(writer);
+/// Reads JSON from temporary file and write an obkv batch to writer.
+pub fn read_json(file: &File, writer: impl Write) -> Result<u64> {
+    let mut builder = DocumentsBatchBuilder::new(BufWriter::new(writer));
     let mmap = unsafe { MmapOptions::new().map(file)? };
     let mut deserializer = serde_json::Deserializer::from_slice(&mmap);
 
@@ -151,8 +151,8 @@ pub fn read_json(file: &File, writer: impl Write + Seek) -> Result<u64> {
 }
 
 /// Reads JSON from temporary file  and write an obkv batch to writer.
-pub fn read_ndjson(file: &File, writer: impl Write + Seek) -> Result<u64> {
-    let mut builder = DocumentsBatchBuilder::new(writer);
+pub fn read_ndjson(file: &File, writer: impl Write) -> Result<u64> {
+    let mut builder = DocumentsBatchBuilder::new(BufWriter::new(writer));
     let mmap = unsafe { MmapOptions::new().map(file)? };
 
     for result in serde_json::Deserializer::from_slice(&mmap).into_iter() {
diff --git a/meilisearch/src/routes/indexes/documents.rs b/meilisearch/src/routes/indexes/documents.rs
index a74bbff49..43fab1dae 100644
--- a/meilisearch/src/routes/indexes/documents.rs
+++ b/meilisearch/src/routes/indexes/documents.rs
@@ -425,11 +425,9 @@ async fn document_addition(
     let read_file = buffer.into_inner().into_std().await;
     let documents_count = tokio::task::spawn_blocking(move || {
         let documents_count = match format {
-            PayloadType::Json => read_json(&read_file, update_file.as_file_mut())?,
-            PayloadType::Csv { delimiter } => {
-                read_csv(&read_file, update_file.as_file_mut(), delimiter)?
-            }
-            PayloadType::Ndjson => read_ndjson(&read_file, update_file.as_file_mut())?,
+            PayloadType::Json => read_json(&read_file, &mut update_file)?,
+            PayloadType::Csv { delimiter } => read_csv(&read_file, &mut update_file, delimiter)?,
+            PayloadType::Ndjson => read_ndjson(&read_file, &mut update_file)?,
         };
         // we NEED to persist the file here because we moved the `udpate_file` in another task.
         update_file.persist()?;