Root cause of this problem was OAK-8591 (bug in OAK) and the incremental indexing problem was resolved by upgrading the OAK version 1.8.20 . As per OAK-8591 :-Affects Version/s:1.8.0, 1.10.0, 1.12.0, 1.14.0, 1.16.0Fix Version/s:1.18.0, 1.10.5, 1.8.17 @kautuk_sahni @vanegi