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Fixing handling of subobject mappings in simulate ingest API #132046

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Fixing handling of subobject mappings in simulate ingest API #132046

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63f1fb4
Fixing handling of subobject mappings in simulate ingest API
masseyke Jul 28, 2025
361acd9
Update docs/changelog/132046.yaml
masseyke Jul 28, 2025
dde0cca
Update docs/changelog/132046.yaml
masseyke Jul 28, 2025
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6 changes: 6 additions & 0 deletions docs/changelog/132046.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
pr: 132046
summary: Fixing handling of subobject mappings in simulate ingest API
area: Ingest Node
type: bug
issues:
- 131608
49 changes: 49 additions & 0 deletions ...-dependencies/src/yamlRestTest/resources/rest-api-spec/test/ingest/80_ingest_simulate.yml
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Expand Up @@ -1740,3 +1740,52 @@ setup:
- match: { docs.0.doc._source.abc: "sfdsfsfdsfsfdsfsfdsfsfdsfsfdsf" }
- match: { docs.0.doc.ignored_fields: [ {"field": "abc"} ] }
- not_exists: docs.0.doc.error

---
"Test ingest simulate with mapping addition on subobjects":

- skip:
features:
- headers
- allowed_warnings

- do:
indices.put_index_template:
name: subobject-template
body:
index_patterns: subobject-index*
template:
mappings:
properties:
a.b:
type: match_only_text

# Here we provide a mapping_substitution to the subobject, and make sure that it is applied rather than throwing an
# exception.
- do:
headers:
Content-Type: application/json
simulate.ingest:
body: >
{
"docs": [
{
"_index": "subobject-index-1",
"_id": "AZgsHA0B41JjTOmNiBKC",
"_source": {
"a.b": "some text"
}
}
],
"mapping_addition": {
"properties": {
"a.b": {
"type": "keyword"
}
}
}
}
- length: { docs: 1 }
- match: { docs.0.doc._index: "subobject-index-1" }
- match: { docs.0.doc._source.a\.b: "some text" }
- not_exists: docs.0.doc.error
2 changes: 1 addition & 1 deletion server/src/main/java/org/elasticsearch/action/bulk/TransportSimulateBulkAction.java
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Expand Up @@ -351,7 +351,7 @@ private Collection<String> validateUpdatedMappings(
.putMapping(new MappingMetadata(updatedMappings))
.build();
Engine.Index result = indicesService.withTempIndexService(originalIndexMetadata, indexService -> {
indexService.mapperService().merge(updatedIndexMetadata, MapperService.MergeReason.MAPPING_UPDATE);
indexService.mapperService().merge(updatedIndexMetadata, MapperService.MergeReason.INDEX_TEMPLATE);
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Hmm… I'm worried we kind of want both behaviors right? The MAPPING_UPDATE one is if we were to update the mapping via the API, while the INDEX_TEMPLATE one is for updating the template. Do we know for sure what the intent is on the user's side?

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My thinking was that if a user wanted to simulate this change, they'd be doing it through an index-template-like update rather than a mapping update, since this change just fails with a mapping update. This API is meant to simulate what would happen if the index had this mapping change, rather than what would happen if I attempted to make this mapping change.

return IndexShard.prepareIndex(
indexService.mapperService(),
sourceToParse,
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