Queue Elasticsearch writes

To better reflect the real service and also improve performance and reduce resource usage it'd be good to find a way to queue the writes to Elasticsearch up.

Can explore using a child/worker thread if it's possible to re-bind from a fresh function call.

Start by locating the Elasticsearch write entry points and reviewing how the local testing server currently performs those writes. Investigate whether a child or worker thread can safely handle queued writes and define completion as writes being queued while preserving service behavior and reducing resource usage.

Written by the indexing model from the issue text.