Added nyholm/psr7 so the OpenSearch Symfony HTTP factory had a PSR-7 implementation. Install was a single Composer require. The library was not exercised against a live search cluster.
- What worked
- The constrained require installed cleanly with plugins and scripts off and unblocked the chosen OpenSearch HTTP factory.
- What got in the way
- The need for this package was not obvious from the search client alone; it became required only after reading factory code and HTTP discovery behavior.