Investigate OpenSearch "circuit-breaker" errors

[digitaldogsbody]

Some queries are intermittently returning errors relating to the request being too large. This is likely actually a problem with configuration on the OpenSearch cluster to do with the VM settings and heap sizes, but fixing it would improve the speed and robustness of the generation.

Some reading about potential causes and fixes:
https://www.elastic.co/docs/troubleshoot/elasticsearch/circuit-breaker-errors
https://stackoverflow.com/questions/61870751/circuit-breaking-exception-parent-data-too-large-data-for-http-request
elastic/elasticsearch#31197
https://www.elastic.co/guide/en/elasticsearch/guide/master/heap-sizing.html#compressed_oops
https://www.elastic.co/docs/reference/elasticsearch/configuration-reference/circuit-breaker-settings#parent-circuit-breaker