I would like to setup the JIRA indexing at a scheduled time.
Welcome to the Atlassian Community!
Are you sure your question is about Jira Cloud? You can not control the Jira indexing mechanism on Cloud.
Sorry this is on-premise.
Alright, I adapted your tags. Out of curiosity: why do you want to schedule this? Normally it is only necessary to run a reindex after configuration changes.
You could create a shell script to trigger the reindex via the REST API with a cron job. See Reindex Jira server using REST API via cURL command for an example.
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