Github user moshebla commented on the issue:
https://github.com/apache/lucene-solr/pull/416
I found this nasty bug in
[AtomicUpdateDocumentMerger#isAtomicUpdate](https://github.com/apache/lucene-solr/pull/416/commits/7cd1dbc3208746541bd80f2d2656b6464fecd23d#diff-50d2f2a4580a649dc2a08749061504a0R78),
where single child docs(non array) were mistaken for an atomicUpdate.
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