Step 1
CHECK TABLE catalogsearch_fulltext
Step 2
REPAIR TABLE catalogsearch_fulltext
Step 3
CHECK TABLE catalogsearch_fulltext
Step 4
REPAIR TABLE catalogsearch_fulltext
Step 5
CHECK TABLE catalogsearch_fulltext
How did I fix «mysqldump: Got error: 145: Table '<…>' is marked as crashed and should be repaired when using LOCK TABLES»?