Add support for $out operand for Aggregation [DATAMONGO-1418]

[spring-projects-issues]

Nikolay Bogdanov opened DATAMONGO-1418 and commented

There is a special operator to save my aggregation data into an output collection - $out (sinse mongo 2.6)
But to get it to work in Spring Data I do the following trick :

DBObject db = newAggregation(....).toDbObject(inputCollectionName, Aggregation.DEFAULT_CONTEXT);
((ArrayList)db.get("pipeline")).add(new BasicDBObject("$out", outCollectionName));
CommandResult res = mongoOperations.executeCommand(db);

I think a new AggregationOperation is required for this. I am going to fix it by myself

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Affects: 1.9.1 (Hopper SR1)

Issue Links:

• DATAMONGO-1358 Add AggregationOperation for $out operator
  ("supersedes")

Referenced from: pull request #361