As discussed some of the articles listed here certain workarounds for paging can be problematic for Solr. Particular search queries seem to have an effect on the search-engine container (Solr), causing it to use a significant amount of memory.
Example queries (note the high page numbers):
/api/v4/search/topic?format=json&ordering=-revoked_date&page=149713
/api/v4/search/topic?format=api&ordering=revoked_date&page=2721
/api/v4/search/credential/facets?format=api&page=318768
/api/v4/search/credential?ordering=effective_date&page=318772
This issue is related to the investigation happening here; bcgov/orgbook-configurations#137