In ElasticSearch version 7.14.2, the following query causes the estimated_size of the request circuit breaker to keep increasing and will not decrease even after 1-2 days

I do unfortunately not have time to look through 4 years worth of potential issues and fixes or set up environments to try and recreate it. I would recommend you test it yourself with a new and supported version (ideally the latest) as I assume you know how to recreate the issue.