In older versions of opensearch-project/opensearch-php, logging was enabled, but it was noisy and not 100% compatible with Drupal's logger-channel implementation. Now that we're requiring v2.4, logging is available in the library but not natively implemented by the search_api_opensearch module. It would be nice to be able to turn on debug-logging for all HTTP transactions.
OpenSearch\HttpClient\GuzzleHttpClientFactory::create() looks for a configuration element called 'on_client_stack'. If found, it will generate and dispatch an event to modify the Guzzle client stack. If we configure this, we can inject logging middleware into the Guzzle stack. There are several off-the-shelf HTTP logging middleware libraries available on Packagist; I suggest using gmponos/guzzle_logger. We should put this in the ‘suggest’ section of the module's composer.json, with the annotation that debugging cannot happen without the presence of this library.
There will be a new "debug" checkbox on the connector configuration page.
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daniel_j → changed the visibility of the branch 3.x to hidden.
Uh, I just remembered that I had added the on_client_stack configuration to opensearch-php via a patch. I'll attach the patch here, but it certainly makes merging this MR less attractive. I guess I'd better submit my patch upstream as well.