update solr config for Filter Cache Evictions

[rlskoeser]

flagged by Max on PUL slack for cdh_ppa but may be relevant to other applications using Solr

I'm not sure where your Solr configurations live, but a bunch of ours live here - https://github.com/pulibrary/pul_solr/tree/main/solr_configs. The Catalog filterCache setting lives here - https://github.com/pulibrary/pul_solr/blob/05d87860a7837c62135dedc949ed608644666cd3/solr_configs/catalog-production-v2/conf/solrconfig.xml#LL1[…]C38
There's more documentation here - https://solr.apache.org/guide/8_3/query-settings-in-solrconfig.html
My very basic understanding is that you want to dial in your cache settings so that you don't get a ton of evictions, and you get a fairly high hit ratio, without over-taxing your machine's memory. Right now, what's in Datadog as cdh_ppa has very very high filter cache evictions, and very low filter cache hit ratio, so you might want to give a higher value to your filterCache in your conf/solrconfig.xml