You can apply administrative operations one at a time to a specific text index. To prevent conflicts, a command lock is automatically sent when an operation starts and is removed when an operation ends. However, text indexes might also be affected by operations that are not managed through DB2® Text Search. For such cases you can now set the command lock manually.
db2ts set command locks for index i1 for text
db2 "call sysproc.systs_admin_cmd('set command locks for index i1 for text', 'en_US', ?)"