Merge #4992

4992: fix the bad experimental search queue size r=dureuill a=irevoire

# Pull Request

## Related issue
Fixes #4991 

## What does this PR do?
- Set the right default value for the experimental search queue size in the config file


Co-authored-by: Tamo <tamo@meilisearch.com>

meilisearch/src/option.rs

@@ -357,8 +357,8 @@ pub struct Opt {
     /// Lets you customize the size of the search queue. Meilisearch processes your search requests as fast as possible but once the
     /// queue is full it starts returning HTTP 503, Service Unavailable.
     /// The default value is 1000.
-    #[clap(long, env = MEILI_EXPERIMENTAL_SEARCH_QUEUE_SIZE, default_value_t = 1000)]
-    #[serde(default)]
+    #[clap(long, env = MEILI_EXPERIMENTAL_SEARCH_QUEUE_SIZE, default_value_t = default_experimental_search_queue_size())]
+    #[serde(default = "default_experimental_search_queue_size")]
     pub experimental_search_queue_size: usize,
 
     /// Experimental logs mode feature. For more information, see: <https://github.com/orgs/meilisearch/discussions/723>
@@ -890,6 +890,10 @@ fn default_dump_dir() -> PathBuf {
     PathBuf::from(DEFAULT_DUMP_DIR)
 }
 
+fn default_experimental_search_queue_size() -> usize {
+    1000
+}
+
 /// Indicates if a snapshot was scheduled, and if yes with which interval.
 #[derive(Debug, Default, Copy, Clone, Deserialize, Serialize)]
 pub enum ScheduleSnapshot {