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https://issues.apache.org/jira/browse/SOLR-12865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17101512#comment-17101512
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Jan Høydahl commented on SOLR-12865:
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Have you tried the newest example for 8.x?
https://lucene.apache.org/solr/guide/8_5/transforming-and-indexing-custom-json.html#indexing-nested-documents
It looks like the example has been heavily re-worked since 7.5.
> Custom JSON parser's nested documents example does not work
> -----------------------------------------------------------
>
> Key: SOLR-12865
> URL: https://issues.apache.org/jira/browse/SOLR-12865
> Project: Solr
> Issue Type: Bug
> Components: documentation
> Affects Versions: 7.5
> Reporter: Alexandre Rafalovitch
> Priority: Major
> Labels: json
>
> The only exam we have for indexing nested JSON using JSON parser does not
> seem to work:
> [https://lucene.apache.org/solr/guide/7_5/transforming-and-indexing-custom-json.html#indexing-nested-documents]
> Attempt 1, using default schemaless mode:
> # bin/solr create -c json_basic
> # Example command in V1 format (with core name switched to above)
> # Indexing fails with: *"msg":"[doc=null] missing required field: id"*. My
> guess it is because the URPs chain do not apply to inner children records
> Attempt 2, using techproducts schema configuration:
> # bin/solr create -c json_tp -d sample_techproducts_configs
> # Same example command with new core
> # Indexing fails with: *"msg":"Raw data can be stored only if split=/"* (due
> to presence of srcField in the params.json)
> Attempt 3, continuing the above example, but taking out srcField
> configuration:
> # Update params.json to remove srcField
> # Same example command
> # It indexes (but not commits)
> # curl http://localhost:8983/solr/json_tp/update/json -v -d '\{commit:{}}
> # The core now contains only one document with auto-generated "id" and
> "_version_" field (because we have mapUniqueKeyOnly in params.json)
> Attempt 4, removing more keys
> # Update params.json to remove mapUniqueKeyOnly
> # Same example command
> # Indexing fails with: *"msg":"Document is missing mandatory uniqueKey
> field: id"*
> There does not seem to be way to index the nested JSON using the transformer
> approach.
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