///<summary>POST on /_security/oauth2/token <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-token.html</para></summary>
///<param name = "body">The token request to get</param>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public Task <TResponse> GetUserAccessTokenAsync <TResponse>(PostData body, GetUserAccessTokenRequestParameters requestParameters = null, CancellationToken ctx = default)
where TResponse : class, IElasticsearchResponse, new() => DoRequestAsync <TResponse>(POST, "_security/oauth2/token", ctx, body, RequestParams(requestParameters));
///<summary>POST on /_security/oauth2/token <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-token.html</para></summary>
///<param name = "body">The token request to get</param>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public TResponse GetUserAccessToken <TResponse>(PostData body, GetUserAccessTokenRequestParameters requestParameters = null)
where TResponse : class, IElasticsearchResponse, new() => DoRequest <TResponse>(POST, "_security/oauth2/token", body, RequestParams(requestParameters));
