DateBridge for ZonedDateTime in hibernate search gives exception while indexing the data

A ZoneOffset is a ZoneId, so this code is correct:

    ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(date.toInstant(), ZoneOffset.UTC);

However, Hibernate Search uses a very specific format when serializing zoned date times to JSON. That format requires that an actual region ID be present (not just an offset).

That can be considered as a bug, and you're welcome to open a bug report, but I'm afraid that's not the only problem. Even if this problem was fixed in Search 5, in order to successfully index such a value, we would still need to backport a fix for HSEARCH-3548, which as far as I understand requires backward-incompatible changes to the Elasticsearch mapping generated by Hibernate Search. So I'm not sure this is something that can actually be fixed in 5.11.

Elasticsearch support in Hibernate Search 5 is experimental. If you can, you'll have a much better time upgrading to Hibernate Search 6 (still in beta) which provides first-class support for Elasticsearch 5.6 to 7.x, and which actually has a test for your specific problem (and it works correctly). The APIs in Hibernate Search 6 are different, however.