So i figured out the issue i was facing
https://issues.apache.org/jira/browse/SOLR-9803
<updateHandler class="solr.DirectUpdateHandler2">
<updateLog>
<str name="dir">${solr.ulog.dir:}</str>
<int
name="numVersionBuckets">${solr.ulog.numVersionBuckets:8388608}</int>
</updateLog>
i had a huge value set fir numVersioinBuckets which was causing memory leak
as stated in issue 9803
Changing to default value solved my problem
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