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Original Description

Description:

No documentation summary in engineering ticket

Engineering Ticket Description:

In SERVER-35893, we changed $out to accept new syntax in the form

$out: {
    mode: "insert" | "replace",
    dropTarget: true | false
}

After some discussion, we'd like to ban dropTarget: true with any mode other than mode: "insert". Therefore, we'd like to collapse dropTarget into another mode and rename them appropriately:

$out: {
    mode: "insertDocuments" | "replaceDocuments" | "replaceCollection"
}

Names subject to bikeshedding!

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