elasticsearch/docs/reference/rest-api/timeoutparms.asciidoc

`timeout`::
  (time units) Specifies the period of time to wait for a response. If no
  response is received before the timeout expires, the request fails and
  returns an error. Defaults to `30s`. For more information about
  time units, see <<time-units>>.

`master_timeout`::
  (time units) Specifies the period of time to wait for a connection to the
  master node. If no response is received before the timeout expires, the request
  fails and returns an error. Defaults to `30s`. For more information about
  time units, see <<time-units>>.