Changes:
* Adds a tutorial for search templates.
* Adds reference docs for the render search template API.
* Improves parameter documentation for the multi search template API.
* Removes duplicate examples from the search template API, multi search API, and create stored script API docs.
* Splits the source files for the search template API and the multi search template API docs.
Partially defined indices options have always been allowed in watches,
but the cleanup in #65332 removed this ability and made the definition
of indices options within a watch require all fields. This change fixes
this by updating the parsing to accept a default indices options and
add test coverage for this scenario.
Closes#68022
Types have been deprecated and this commit removes the documentation
for specifying types in the index action, and search input/transform.
Relates #37594#35190
This commit changes the format of the `hits.total` in the search response to be an object with
a `value` and a `relation`. The `value` indicates the number of hits that match the query and the
`relation` indicates whether the number is accurate (in which case the relation is equals to `eq`)
or a lower bound of the total (in which case it is equals to `gte`).
This change also adds a parameter called `rest_total_hits_as_int` that can be used in the
search APIs to opt out from this change (retrieve the total hits as a number in the rest response).
Note that currently all search responses are accurate (`track_total_hits: true`) or they don't contain
`hits.total` (`track_total_hits: true`). We'll add a way to get a lower bound of the total hits in a
follow up (to allow numbers to be passed to `track_total_hits`).
Relates #33028
James Rodewig
Jay Modi
debadair
Lisa Cawley
James Rodewig
Jake Landis
Jim Ferenczi
Ryan Ernst