Add ESQL operator

[dnhatn]

This pull request introduces the ES|QL operator. This operator, for now, supports only two main parameters: query and filter.

[dnhatn]

/cc @craigtaverner

[b-deam]

There are a couple of high level properties that operations should expose, namely:

• request-timeout
• headers
• opaque-id

You can add support for these by using the Runner._transport_request_params helper method:

rally/esrally/driver/runner.py

Lines 210 to 231 in fc7d959

	def _transport_request_params(params):
	"""
	Takes all of a runner's params and splits out request parameters, transport
	level parameters, and headers into their own respective dicts.
	:param params: A hash with all the respective runner's parameters.
	:return: A tuple of the specific runner's params, request level parameters, transport level parameters, and headers, respectively.
	"""
	transport_params = {}
	request_params = params.get("request-params", {})
	if request_timeout := params.pop("request-timeout", None):
	transport_params["request_timeout"] = request_timeout
	if (ignore_status := request_params.pop("ignore", None)) or (ignore_status := params.pop("ignore", None)):
	transport_params["ignore_status"] = ignore_status
	headers = params.pop("headers", None) or {}
	if opaque_id := params.pop("opaque-id", None):
	headers.update({"x-opaque-id": opaque_id})
	return params, request_params, transport_params, headers

An example of usage:

rally/esrally/driver/runner.py

Line 1971 in fc7d959

params, request_params, transport_params, headers = self._transport_request_params(params)

[b-deam]

LGTM. I left one comment about using a helper method around configuring the different request, transport, and header parameters but no need for another review.

[dnhatn]

@b-deam @gbanasiak Thanks for reviews.

[dnhatn]

@elasticmachine run rally/it-python310 please

[craigtaverner]

The description here should indicate that this is used for anything additions to put into the body, since the query will already be placed there. For example, we use this for pragma.