Hello! Our community has 1.6 million posts. The maximum search results are set to 800 right now and we're using standard analyzer. But my sysadmin says that ES is running hundreds of processes and eating lots of memory.
I only have one process: Java. What ElasticSearch does inside of Java is beyond me, though. We did cut our search results in half (I think it's 500 now), we use the stemmer, and we are near 10 million posts. XF's Enhanced Search would not run any processes outside of what you'd normally see in http/php processes.