Fix MultipleFailureException

✅ Solution

MultipleFailureException in Elasticsearch tests usually indicates that multiple assertions within a single test method are failing, but only the first failure is reported, masking subsequent errors. To fix this, use `assertAll()` (or a similar bulk assertion mechanism provided by the testing framework) to execute all assertions and report every failure, which helps reveal the root cause and prevents incomplete testing. This ensures that all potential errors are identified, rather than just the first one encountered.