title: InnoDB: Error (Duplicate key) writing word node to FTS auxiliary index table. From myServerName.err
body: <p>I have Mysql server running on windows server 2012 since 2015, I found too much error messages in .err log file, messages are:
  2019-06-12 09:26:39 2064  InnoDB: Error (Duplicate key) writing word node to FTS auxiliary index table.</p>
  
  <p>And it still receiving errors daily.
  What is that error meaning, can this error effect Mysql performance?<br>
  Note: mysql server is used from multiple projects.</p>