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Add ClearIndicesCacheParametersIT to test and document the current behavior of the clear cache API across all query parameter combinations (request, query, fielddata). Tests exercise the full REST flow via real HTTP requests and verify which caches are actually cleared by checking index stats. The tests document the bug from elastic#94512: when only request=true is specified, all three caches are cleared instead of just the request cache. This happens because IndexService.clearCaches() cannot distinguish between 'not specified' (default false) and 'explicitly set to false'. Co-authored-by: Ben Chaplin <benchaplin@protonmail.com>
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gradle check?This PR introduces a new integration test suite,
ClearIndicesCacheParametersIT, to investigate and confirm the query parameter parsing bug in the Clear Cache API (related to elastic#94512).The tests demonstrate that the
_cache/clearendpoint incorrectly interprets boolean query parameters (e.g.,request=falseorrequestnot specified) as "clear all" due to a fallback mechanism inIndexService.clearCachesandIndicesService.clearIndexShardCache. This occurs because the system cannot distinguish between a parameter being explicitly set tofalseand it defaulting tofalsewhen not provided.The 19 test methods cover various combinations of
request,query, andfielddataparameters. All tests currently pass, asserting the existing (buggy) behavior. Specific test cases that highlight the bug are clearly marked with[BUG]in their assertion messages and Javadoc, making it straightforward to flip the assertions once a fix is implemented.