Another thing you can do - and which has helped me in the past quite a few
times - is to just run JVisualVM, attach to Solr's Java process and enable
the CPU sampler under the Sampler tab.
As you run indexing the methods that most time is spent on will appear near
the top.
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I've worked in the past for a Solr 5.x custom plugin using AspectJ to track
the # of calls as well as the time spent inside /incrementToken()/ of all
Tokenizers and Filters used during indexing. I could get stats per Solr
indexing thread, not per indexing request though. In any case you could spot