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https://issues.apache.org/jira/browse/COUCHDB-2867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962083#comment-15962083
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Stefan Buhrmester commented on COUCHDB-2867:
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afaik mongo doesn't use the `.[]` part to tell the indexer that the field is an
array. It detects it automatically (so in Mongo, simply specificing `tags.name`
is enough even if `tags` is an array, see here
https://docs.mongodb.com/manual/core/index-multikey/). The `.[]` part is what
lucene `{type: "text'}` index definitions are using.
> Mango: should be able to index *within* arrays
> ----------------------------------------------
>
> Key: COUCHDB-2867
> URL: https://issues.apache.org/jira/browse/COUCHDB-2867
> Project: CouchDB
> Issue Type: Improvement
> Components: Mango
> Reporter: Nolan Lawson
>
> If you have a document like:
> {code:javascript}
> {
> "_id": "foo",
> "tags": ["a", "b", "c"]
> }
> {code}
> ...then you should be able to run queries that find e.g. all documents with
> "a" as a tag, and it should be *indexed*. Currently there doesn't seem to be
> any way to do this except as an in-memory selector, which is a real bummer,
> because it's a super common use case. (Tags, categories, labels, etc.)
> Originally I thought this was how {{$elemMatch}} worked, and I was surprised
> to learn that that's not the case.
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