PHPLIB-1750 Relax search index management spec test to allow the extra 'field' property

[GromNaN]

Fix PHPLIB-1750

The docker image mongodb/mongodb-atlas-local have a different behavior than MongoDB Atlas.

This change makes the test less sensible to the server output.

Fixed test:

Expected :'{ "mappings" : { "dynamic" : false } }'
Actual   :'{ "mappings" : { "dynamic" : false, "fields" : { } } }'

[Copilot]

Pull request overview

This PR relaxes the search index management spec test to accommodate behavioral differences between mongodb/mongodb-atlas-local and MongoDB Atlas. The docker image returns an additional empty fields property in the mapping response that causes test failures with strict document comparison.

Key Changes:

• Replaced strict document equality assertions with targeted boolean checks on the dynamic property
• Modified three test methods to verify only the dynamic field value instead of the entire mapping structure

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