///<summary>GET on /_security/user <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user.html</para></summary>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public TResponse GetUser <TResponse>(GetUserRequestParameters requestParameters = null)
where TResponse : class, IElasticsearchResponse, new() => DoRequest <TResponse>(GET, "_security/user", null, RequestParams(requestParameters));
///<summary>GET on /_security/user <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user.html</para></summary>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public Task <TResponse> GetUserAsync <TResponse>(GetUserRequestParameters requestParameters = null, CancellationToken ctx = default)
where TResponse : class, IElasticsearchResponse, new() => DoRequestAsync <TResponse>(GET, "_security/user", ctx, null, RequestParams(requestParameters));
///<summary>GET on /_security/user/{username} <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user.html</para></summary>
///<param name = "username">A comma-separated list of usernames</param>
///<param name = "requestParameters">Request specific configuration such as querystring parameters & request specific connection settings.</param>
public TResponse GetUser <TResponse>(string username, GetUserRequestParameters requestParameters = null)
where TResponse : class, IElasticsearchResponse, new() => DoRequest <TResponse>(GET, Url($"_security/user/{username:username}"), null, RequestParams(requestParameters));