Fix MinIO configuration to always set region to 'minio. Fixes #5822 (#5823)

Author: fmassot

docs/configuration/storage-config.md

@@ -90,7 +90,7 @@ The Google Cloud Storage flavor (`gcs`) turns off multi-object delete requests a
 
 *MinIO flavor*
 
-The MinIO flavor (`minio`) forces path-style access.
+The MinIO flavor (`minio`) overrides the `region` parameter to `minio` and forces path-style access.
 
 Example of a storage configuration for Google Cloud Storage in YAML format:
 

quickwit/quickwit-config/src/storage_config.rs

@@ -347,6 +347,7 @@ impl S3StorageConfig {
                 self.disable_multipart_upload = true;
             }
             Some(StorageBackendFlavor::MinIO) => {
+                self.region = Some("minio".to_string());
                 self.force_path_style_access = true;
             }
             _ => {}
@@ -497,6 +498,7 @@ mod tests {
         assert!(gcs_storage_config.disable_multipart_upload);
 
         let minio_storage_config = storage_configs[3].as_s3().unwrap();
+        assert_eq!(minio_storage_config.region, Some("minio".to_string()));
         assert!(minio_storage_config.force_path_style_access);
     }