MDEV-25581 Allow user thread to do InnoDB fts cache sync
Problem: ======== InnoDB FTS requesting the fts sync of the table once the fts cache size reaches 1/10 of innodb_ft_cache_size. But fts_sync() releases cache lock when writing the word. By doing this, InnoDB insert thread increases the innodb fts cache memory and SYNC operation will take more time to complete. Solution: ========= Remove the fts sync operation(FTS_MSG_SYNC_TABLE) from the fts optimize background thread. Instead of that, allow user thread to sync the InnoDB fts cache when the cache size exceeds 512 kb. User thread holds cache lock while doing cache syncing, it make sure that other threads doesn't add the docs into the cache. Removed FTS_MSG_SYNC_TABLE and its related function because we do remove the FTS_MSG_SYNC_TABLE message itself. Removed fts_sync_index_check() and all related function because other threads doesn't add while cache operation going on.
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