DeleteByQueryRequest deleteRequest = new DeleteByQueryRequestyour_index_name;deleteRequestsetQueryQueryBuildersmatchAllQuery;deleteReques找不到setQuery

I apologize for the error in my previous response. The correct way to set the query for a DeleteByQueryRequest in Elasticsearch is as follows:

DeleteByQueryRequest deleteRequest = new DeleteByQueryRequest("your_index_name");
deleteRequest.setQuery(QueryBuilders.matchAllQuery());

This code will create a DeleteByQueryRequest object for the specified index name and set the query to match all documents in the index.