You need to check 'ft_pending' database table records. You will get some idea about count of pending records. Enable FTS logs and server information form and check it. Check the plugin and other logs too of arserver \db directory to check if there is any error in the reindexing process.
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You need to monitor that table. If there is no error in reindexing process then count should be reduced after some time.
Please check this :
and some performance recommendations :