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Backwards Compatibility:
Fully Compatible
Sprint:
Query 2019-05-06, Query 2019-05-20, Query 2019-06-03, Query 2019-06-17

Remove any special kind of $out stage, translate existing tests to use $merge:

Written as

Translates to

{$out: {
  to: "x",
  uniqueKey: {x_id: 1},
  mode: "insertDocuments"
}}

⟶

{$merge: {
  into: "x",
  on: "x_id"
  whenMatched: "fail",
  whenNotMatched: "insert"
}}

{$out: {
  to: "x",
  uniqueKey: {x_id: 1},
  mode: "replaceDocuments"
}}

⟶

{$merge: {
  into: "x",
  on: "x_id",
  whenMatched: "replaceWithNew",
  whenNotMatched: "insert"
}}

depends on

SERVER-41198 Translate $out tests in jstests/aggregation/sources/out to use $merge

SERVER-41199 Translate $out tests in jstests/sharding to use $merge

SERVER-41200 Translate tests in other directories to use $merge

SERVER-40430 Add $merge support for whenMatched: 'merge'

SERVER-40431 Add $merge support for whenMatched: pipeline