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Documentation Changes Summary:

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1. What would you like to communicate to the user about this feature?
2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

mongoc_collection_aggregate documents:

pipeline: A bson_t, either a BSON array or a BSON document containing an array field named “pipeline”.

Constructing a BSON "array" requires constructing a BSON document with keys "0", "1", "2", ...

I think it's worth adding to the examples on that page an example of using this form pipeline, e.g. with:

pipeline = BCON_NEW ("[", "{", "$match", "{" "foo", BCON_UTF8("a"), "}", "}", "]");