Snowball token filter with default language breaks `indices.get()`

[fabriziofortino]

Java API client version

8.13.4

Java version

17

Elasticsearch Version

8.13.4

Problem description

I have an index using an analyzer that contains a snowball token filter without specifying the language. This should default to English.

  "snowball_4": {
    "type": "snowball"
  }

indices.get() request fails with the following Exception:

Exception in thread "main" co.elastic.clients.transport.TransportException: node: https://es-host/, status: 200, [es/indices.get] Failed to decode response
        at co.elastic.clients.transport.ElasticsearchTransportBase.decodeTransportResponse(ElasticsearchTransportBase.java:404)
        at co.elastic.clients.transport.ElasticsearchTransportBase.getApiResponse(ElasticsearchTransportBase.java:363)
        at co.elastic.clients.transport.ElasticsearchTransportBase.performRequest(ElasticsearchTransportBase.java:147)
        at co.elastic.clients.elasticsearch.indices.ElasticsearchIndicesClient.get(ElasticsearchIndicesClient.java:965)
        at co.elastic.clients.elasticsearch.indices.ElasticsearchIndicesClient.get(ElasticsearchIndicesClient.java:981)
Caused by: co.elastic.clients.json.JsonpMappingException: Error deserializing co.elastic.clients.elasticsearch._types.analysis.TokenFilterDefinition: co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'SnowballTokenFilter.language' (JSON path: ['my-index'].settings.index.analysis.filter.snowball_4) (line no=1, column no=13286, offset=-1)
        at co.elastic.clients.json.JsonpMappingException.from0(JsonpMappingException.java:134)
        at co.elastic.clients.json.JsonpMappingException.from(JsonpMappingException.java:121)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:218)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:148)
        at co.elastic.clients.json.BuildFunctionDeserializer.deserialize(BuildFunctionDeserializer.java:53)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:48)
        at co.elastic.clients.json.UnionDeserializer$SingleMemberHandler.deserialize(UnionDeserializer.java:75)
        at co.elastic.clients.json.UnionDeserializer.deserialize(UnionDeserializer.java:304)
        at co.elastic.clients.json.UnionDeserializer.deserialize(UnionDeserializer.java:259)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.JsonpDeserializerBase$StringMapDeserializer.deserialize(JsonpDeserializerBase.java:349)
        at co.elastic.clients.json.JsonpDeserializerBase$StringMapDeserializer.deserialize(JsonpDeserializerBase.java:333)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:78)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:192)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:148)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:78)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:192)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:148)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:78)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:192)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:148)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:78)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:192)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:148)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.JsonpDeserializerBase$StringMapDeserializer.deserialize(JsonpDeserializerBase.java:349)
        at co.elastic.clients.json.JsonpDeserializerBase$StringMapDeserializer.deserialize(JsonpDeserializerBase.java:333)
        at co.elastic.clients.elasticsearch.indices.GetIndexResponse.lambda$createGetIndexResponseDeserializer$0(GetIndexResponse.java:184)
        at co.elastic.clients.json.JsonpDeserializer$3.deserialize(JsonpDeserializer.java:136)
        at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:77)
        at co.elastic.clients.transport.ElasticsearchTransportBase.decodeTransportResponse(ElasticsearchTransportBase.java:399)
        ... 16 more
Caused by: co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'SnowballTokenFilter.language'
        at co.elastic.clients.util.ApiTypeHelper.requireNonNull(ApiTypeHelper.java:76)
        at co.elastic.clients.elasticsearch._types.analysis.SnowballTokenFilter.<init>(SnowballTokenFilter.java:66)
        at co.elastic.clients.elasticsearch._types.analysis.SnowballTokenFilter.<init>(SnowballTokenFilter.java:58)
        at co.elastic.clients.elasticsearch._types.analysis.SnowballTokenFilter$Builder.build(SnowballTokenFilter.java:131)
        at co.elastic.clients.elasticsearch._types.analysis.SnowballTokenFilter$Builder.build(SnowballTokenFilter.java:104)
        at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:80)
        at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
        at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:78)
        at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:209)
        ... 56 more

[l-trotta]

Hello, thank you for reporting this! Yes the language field should be optional, we'll fix this in the API specification used to produce the Java code and then regenerate the client.