Full-Text Search needs to be maintained to help ensure it is running well. Catalogs can become fragmented, which can reduce search performance, and various environmental issues can cause documents to fail during indexing.
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To check for documents that failed to index and to re-queue failed documents for indexing, see Re-Queuing Documents That Failed to Index.
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To defragment and clean full-text catalogs, see Defragmenting and Cleaning Full-Text Catalogs.
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For more general troubleshooting, see the troubleshooting section the Installation chapter of the Full-Text Search module reference guide.