From elasticsearch 8.0, we've introduced a new API for vector search: [_knn_search](https://www.elastic.co/guide/en/elasticsearch/reference/master/knn-search.html). We need rally to support _knn_search endpoint, so we can introduce `_knn_search` operation for vector search benchmarking.
From elasticsearch 8.0, we've introduced a new API for vector search: _knn_search.
We need rally to support _knn_search endpoint, so we can introduce
_knn_searchoperation for vector search benchmarking.