From the Connectors > CRAWLER CONNECTOR > Operations and
Inspection tab:
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Stop/Start crawl – stops or starts the crawl threads.
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Clear documents – deletes all connector documents from the system
and the connector state is reset.
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Clean documents – deletes crawled documents in the index if they
do not match the existing applied rules. It is useful if you have removed sites from the
configuration, or applied stricter crawl rules, and want to get rid of "unwanted
documents".
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Reindex documents – reindexes all documents from the crawler
storage (it does not need to download them again).
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Expand Advanced inspection to monitor the scheduler state.