[7.17] Add a highlighter unit test base class (#85719) #87413
Merged
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The vast majority of our highlighter tests are integration or rest tests, which exercise
the full ES stack but take a long time to run and are difficult to debug. We have a few
unit tests but they are testing very low-level behaviour, and don't interact with the fetch
phase or hit contexts. This commit adds a new HighlighterTestCase base class with some
helper methods that should fill the gap between these two sets of tests. It includes a
method that takes a MapperService, ParsedDocument and SearchSourceBuilder, and then
runs the appropriate highlighter fetch subphase over the resulting hit.