Github user dsmiley commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/443#discussion_r214044533
--- Diff: solr/solr-ref-guide/src/transforming-result-documents.adoc ---
@@ -137,6 +137,7 @@ When using this transformer, the `parentFilter`
parameter must be specified, and
* `childFilter` - query to filter which child documents should be
included, this can be particularly useful when you have multiple levels of
hierarchical documents (default: all children)
* `limit` - the maximum number of child documents to be returned per
parent document (default: 10)
+* `fl` - the field list which the transformer is to return.
--- End diff --
... "There is a further limitation in which the fields here should be a
subset of those specified by the top level fl param." And say defaults to the
top level "fl" ?
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