Add Airflow Connections for Elasticsearch clusters

[AetherUnbound]

Description

Add the connection information for the staging & production Elasticsearch connections in the Airflow UI, as described by the implementation plan: https://docs.openverse.org/projects/proposals/search_relevancy_sandbox/20230518-implementation_plan_staging_index_rapid_iteration.html#airflow-connections

Additional context

This is blocked by #2370 and is a part of #392

[stacimc]

@AetherUnbound I've forgotten why this is needed separate from the existing connections, and how it's meant to be used. The IP describes and links to the ElasticsearchPythonHook, which doesn't seem to accept a conn_id. I can get it working locally thogh with something like:

# Using the existing value from AIRFLOW_CONN_ELASTICSEARCH_HTTP_STAGING
elastic_hook = ElasticsearchPythonHook(hosts="http://es:9200")

conn = elastic_hook.get_conn()
old_index = conn.indices.get(index="audio-init")

# Omitted for space, but I was also able to create a new index 

Do we mean to use the ElasticsearchHook instead?

[AetherUnbound]

Yea I was just thinking about this one 😅 I made it based on the assumption of how other providers work, it seems it's unnecessary for Elasticsearch! We can close this.