///<summary>POST on /{index}/_eql/search <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/eql-search-api.html</para></summary>
///<param name = "index">A comma-separated list of index names to search; use the special string `_all` or Indices.All to perform the operation on all indices</param>
///<param name = "body">Eql request body. Use the `query` to limit the query scope.</param>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public TResponse Search <TResponse>(string index, PostData body, EqlSearchRequestParameters requestParameters = null)
where TResponse : class, ITransportResponse, new() => DoRequest <TResponse>(POST, Url($"{index:index}/_eql/search"), body, RequestParams(requestParameters));
public Task <TResponse> SearchAsync <TResponse>(string index, PostData body, EqlSearchRequestParameters requestParameters = null, CancellationToken ctx = default)
where TResponse : class, ITransportResponse, new() => DoRequestAsync <TResponse>(POST, Url($"{index:index}/_eql/search"), ctx, body, RequestParams(requestParameters));