To fix index corruption, reindex a full-text index after you set its resource status to UNAVAILABLE.
The UNAVAILABLE status makes the full-text index unavailable for searching. Also, the index becomes unavailable for indexing in the following respect: no changes can be made to index entries in the index. The intent is to prevent attempts to access a corrupt index and the generation of errors that result from any such unsuccessful attempts.
To fix a corrupt full-text index: