Add a flag to make capturing the raw query optional

[jzonthemtn]

Add a flag to make capturing the raw query optional. Some users might not want to capture the entire query.

[jzonthemtn]

This is an option that could possibly be desirable to be turned on and off throughout usage of the plugin, and also without requiring a restart of OpenSearch. A new REST endpoint that accepts a JSON object of plugin settings might be useful. The index and id_field settings could also be made available through the new endpoint.

[jzonthemtn]

Another setting is the max_items_batch parameter that controls how many items from the queues are consumed and written each time.

[jzonthemtn]

Closing as OBE.