You can just remove the index files, but I'm afraid you'll face many misbehaviours on JIRA -- gadgets, issue navigator, etc, are highgly dependent of the indexes. So I don't recommend you doing this.
Generally indexes performance issues are related to:
- Poor disk performance;
- Network connectivity (in case of a remote storage);
- Operational System problems;
I suggest you to check the disk speed according described here:
I have tested disk with Support Tools Utility described in this link https://confluence.atlassian.com/display/JIRAKB/Testing+Disk+Access+Speed
And it turned bad results.
Thanks for your answer,
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