Error
com.atlassian.jira.util.RuntimeIOException: org.apache.lucene.store.LockObtainFailedException: Lock held by this virtual machine: /opt/atlassian/jira-data/caches/indexesV1/changes/write.lock
@Laima Valiukonytė Welcome to the community
Looking at your error it looks like Jira Server error not Jira Cloud. Can you please confirm on this?
Also if it is Jira Server (a self hosted version of Jira), you need to stop your Jira, delete caches folder and start Jira again.
Take a look at this page for better explanation - https://confluence.atlassian.com/jirakb/jira-reindex-fails-due-to-underlying-file-changed-by-an-external-force-998640570.html
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