Hi,
I’ve encountered another issue that might be related to nested schema. Not always, but many times atomic updates fails for some shards with the message “TransactionLog doesn't know how to serialize class org.apache.lucene.document.LazyDocument$LazyField”. I checked both options: 1. Set <enableLazyFieldLoading>false</enableLazyFieldLoading>. 2. Set <enableLazyFieldLoading>true</enableLazyFieldLoading> but removed child documents. In both cases atomic update worked without any errors. This might suggest that there is an issue with this combination. Thanks in advance, Ronen.