Currently I am using elastic search for one of the data class of class type concrete. I have noticed that when we made any changes or add new record to this data class, the records are not being indexed and we would have to manually re-index the class.
How are you making changes to the data class, causing the system not recognize these? Were any changes made to the indexing/distributed/queue/maxrecords dynamic system setting causing performance lags?
Did these changes used to be picked up? Note that the system cannot identify conflicts when you make changes in the Custom Search Properties rule form (info here).