I am doing a bulk indexing every 10 minutes using logstash to send data to ElasticSearch. For almost 20 days everything went OK, but today I am getting the following issue:
ElasticSearch is using very high CPU , and when I am getting hot threads it seems that almost all of the big cpu thead are the Lucene merging threads.
My bulk indexing is lasting 4 times longer.
I am running 2 elasticsearch nodes on SSD disk.
Does anyone knows where the problem could come from ?