Elastic search percolator scalability issues

I am running a 4 data node + 2 master node cluster and have created an index to store search queries. In the percolator I store regexp based search queries.
When I run a percolate search passing a document, I see the latency of search/match being very high (~500ms). I have only stored very few (<10) search queries in percolator index but the search latency seems to be at very unacceptable levels.

any thoughts on this?

My index mappings is given below


I store regexp based search queries

I believe that this is the main cause. Regexp queries are slow.

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