Add runtime field section to Field Capabilities API (#68904) #68915
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Currently runtime fields from search requests don't appear in the output of the
field capabilities API, but some consumer of runtime fields would like to see
runtime section just like they are defined in search requests reflected and
merged into the field capabilities output.
This change adds parsing of a "runtime_mappings" section equivallent to the one
on search requests to the
_field_caps
endpoint, passes this section down tothe shard level where any runtime fields defined here overwrite the mapping of
the targetet indices.
Closes #68117