Hi @mikemccand,
After removing these configurations, we did not notice any "now throttling indexing" messages in logs. Thanks for the inputs.
But we did end up in a "No space left on disk" errors after ~36 hours which I'm thinking could be related to enabling doc_values. With doc_values enabled, we observed a huge increase in the amount of disk utilized (nearly twice). Our documents have a ttl of 24 hours. So after 24 hours space should have got continuously reclaimed. Do you see any reasons why the space is not getting reclaimed or may be merging requires additional space to complete.
After around 24 hours, there was around 10G+10G (2 drives) free on each node. But how would we end up with 100% disk utilization on 1-2 nodes if data was continuously getting removed over the next 12 hours of merging activity?