Hi `OptimisticLockingFailureException` is not thrown by spring-data-couchbase but according to the documentation it should be thrown  Instead it is throwing `DataIntegrityViolationException` caused by `CasMismatchException`. https://github.com/spring-projects/spring-data-couchbase/blob/7e45fa24a1ab790d5fd308069a0c886ed3f37f8f/src/main/java/org/springframework/data/couchbase/core/CouchbaseExceptionTranslator.java#L69-L73 Is there an error in the documentation? Related issue: #944 #934