How can i index only one specific JIRA project?
No. Reindexing is for the entire database. Normally there isn't a reason to reindex. JIRA takes care of that normally. It is normally done if you find something odd or inconsistent as a 'try this first' before more trouble shooting.
If you mean indexing in the application, go to Project -> Settings, and hit "re-index project"
If it's database indexing, you don't, you'll have to rebuild the database indices for everything, with Jira offline while you do it.
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