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The Content Index powers Confluence's search functionality and is also used for a number of related functions such as building email threads in the mail archive. While the index is maintained automatically, you may need to rebuild it manually under these circumstances:

If you find that your searching and mail threading are malfunctioning.
After an upgrade (if a reindex is required after an upgrade, it will be noted in upgrade section of the release notes).

To manually rebuild the content index,

Go to the 'Administration Console' and click on 'Content Indexing' under the heading 'Administration' in the left panel.

For reasons of efficiency, content is not immediately added to the index. New and modified Confluence content is first placed in a queue, and the queue is processed once every minute.
Click 'Rebuild Index'.

Indexing can take a long time to complete, depending on the number of pages, number, type and size of attachments and the amount of memory allocated to Confluence.

It may help to increase the heap memory allocation of Confluence by following these instructions.

If you are running an older version of Confluence and find that the index rebuild is not progressing, you may need to shut down Confluence, and restart it with the following Java system property set: bucket.indexing.threads.fixed=1. This will cause the re-indexing to happen in a single thread and be much more stable (but slower).

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