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Description
When working on #66295 @jtibshirani realized that reloading analyzers also doesn't clear the request cache when it probably should. We expect most folks that reload search analyzers probably aren't going to bump into this because they are likely to have non-0 top hits so they won't have the cache enabled by default. But search analyzers can play a part in queries the kind of pure aggregation queries that enable the request cache by default - they can filter the data seen by aggs and they define the filters aggs. Busting the cache when the analyzers is the safest thing from a "correctness" stand point. It is rare so it shouldn't cause a huge performance hit.