When adding to cache protobuf encoded entries of types that are specifically annotated as @Indexed(false) we would expect that nothing is added to the index. But a document with no fields is added instead, cluttering the index. This does not impact the correctness of query results but it impacts performance because every put operation touches the index even if not required. This bug is a consequence of some limitations of the integration point between infinispan and hibernate search: the FieldBridge api.