Elastica does not seem able to find a class from the composer dependency ruflin/elastica:
13:01:17 Fatal error: Class undefined: Elastica\Exception\InvalidException in /workspace/src/extensions/Elastica/tests/phpunit/UtilTest.php on line 40 13:01:17 Destructor threw an object exception: exception 'MWException' with message 'UtilTest::tearDown() must call parent::tearDown()' in /workspace/src/tests/phpunit/MediaWikiTestCase.php:158
Cirrus has similar problems tests cannot find \Elastica\Query\MatchAll but with an additional phan failure on the missing UsageException class from MW Core.
Test patches: