Issue with Elasticsearch occupying too much memory and Kibana getting hanged while querying

ES 6.8.0
Kibana 6.8.0

i have allocated 10 GB in heap size.

when i check performance in task manager the disk utilisation shows around 93%, i there any issue with swap space to increase the memory to prevent it from hanging.

i have changed NODE_OPTIONS="--max-old-space-size=8192" in kibana.bat file. doing this i am getting the below error on opening kibana in browser.
`allocation size overflow (

Version: 6.8.0
Build: 20352
Error: allocation size overflow (

I moved the question to #kibana as the issue is happening there.

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