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/// @startDocuBlock GetApiQuerySlow
/// @brief returns a list of slow running AQL queries
///
/// @RESTHEADER{GET /_api/query/slow, Returns the list of slow AQL queries}
///
/// @RESTDESCRIPTION
/// Returns an array containing the last AQL queries that exceeded the slow
/// query threshold in the selected database.
/// The maximum amount of queries in the list can be controlled by setting
/// the query tracking property `maxSlowQueries`. The threshold for treating
/// a query as *slow* can be adjusted by setting the query tracking property
/// `slowQueryThreshold`.
///
/// Each query is a JSON object with the following attributes:
///
/// - *id*: the query's id
///
/// - *query*: the query string (potentially truncated)
///
/// - *started*: the date and time when the query was started
///
/// - *runTime*: the query's run time up to the point the list of queries was
///   queried
///
/// @RESTRETURNCODES
///
/// @RESTRETURNCODE{200}
/// Is returned when the list of queries can be retrieved successfully.
///
/// @RESTRETURNCODE{400}
/// The server will respond with *HTTP 400* in case of a malformed request,
///
/// @endDocuBlock
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