agturley commented on code in PR #11355:
URL: https://github.com/apache/nifi/pull/11355#discussion_r3456189851
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nifi-extension-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-restapi-processors/src/main/java/org/apache/nifi/processors/elasticsearch/PutElasticsearchJson.java:
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@@ -241,6 +241,11 @@ public class PutElasticsearchJson extends
AbstractPutElasticsearch {
.name("Identifier Field")
.description("""
The name of the field within each document to use as the
Elasticsearch document ID. \
+ A nested field can be referenced with a "/"-delimited
path: for a document \
Review Comment:
So I started on this and ran into something I want to flag before going
further.
The problem is migrateProperties runs on every flow import and restart, and
there's no way to tell a 2.10 literal field name like @metadata/id apart from a
2.11 nested path @metadata/id — they're the exact same string. So if I just
escape slashes, it also escapes legit nested paths and breaks them. I actually
hit this on my test cluster: imported a normal 2.11 flow and every nested-path
case quietly stopped working because the migration had rewritten @metadata/id
to @metadata\/id on import.
The only way I found to make it safe is to rename the three properties
(Identifier Field → Identifier Field Path, etc). Then the old name only exists
in pre-2.11 flows, so I can escape values found under the old name and leave
the new ones alone. That works, but it means renaming three properties
everyone's already using.
This is feeling like a lot for the case we're protecting against — a 2.10
flow that happens to have a literal / in the field name, and slashes aren't
really common in ES field names to begin with. So I'm inclined to skip the
migration and just document it: on upgrade, a field name with a literal / gets
read as a nested path now, and you can escape it as \/ if you want the old
behavior.
Let me know if you'd rather I do the rename though, happy to if you think
the upgrade guarantee is worth it.
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