@Target(value=FIELD)
@Retention(value=RUNTIME)
public @interface ESRetryOnConflict
用于批量操作
In between the get and indexing phases of the update, it is possible that another process might have already updated the same document.
By default, the update will fail with a version conflict exception.
The retry_on_conflict parameter controls how many times to retry the update before finally throwing an exception.