Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

• Start reindexing two project concurrently, or
• Start background and project reindex concurrently.

Expected Results

Only one of these operations can be performed at a time to avoid redundant work.

Actual Results

Multiple project reindexes and background reindex can be run concurrently, potentially leading to JRASERVER-74637.

Workaround

1. Only run a second project reindex when the first one finishes.
2. Do not run project and background reindex at the same time.