$merge not working with partial index

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      db.source.insertOne(
   { id: 1, foo: 999 }
)

db.target.insertMany([
   { id: 1, foo: 123, merge: 0 },
   { id: 2, foo: 456, merge: 0 },
   { id: 1, foo: 789 }
])

db.runCommand(
   {
      createIndexes: "target",
      indexes: [{
         name: "key",
         key: { id: 1 },
         unique: true,
         partialFilterExpression: { merge: { $exists: true } }
      }]
   }
)

db.source.aggregate([
   { $addFields: { merge: 1 } },
   {
      $merge: {
         into: "target",
         on: "a"
      }
   }
])

Error: command failed: {
	"ok" : 0,
	"errmsg" : "Cannot find index to verify that join fields will be unique",
	"code" : 51183,
	"codeName" : "Location51183"
} : aggregate failed :

       

       

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        db.source.insertOne( { id: 1, foo: 999 } ) db.target.insertMany([ { id: 1, foo: 123, merge: 0 }, { id: 2, foo: 456, merge: 0 }, { id: 1, foo: 789 } ]) db.runCommand( { createIndexes: "target" , indexes: [{ name: "key" , key: { id: 1 }, unique: true , partialFilterExpression: { merge: { $exists: true } } }] } ) db.source.aggregate([ { $addFields: { merge: 1 } }, { $merge: { into: "target" , on: "a" } } ]) Error: command failed: { "ok" : 0, "errmsg" : "Cannot find index to verify that join fields will be unique" , "code" : 51183, "codeName" : "Location51183" } : aggregate failed :    
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      I have two collections where I like to run an aggregation pipeline with $merge. However, the target collection has a partial unique index. According documentation $merge also works with spare indexes, so I would assume a partial index should also work.

            Assignee:
            Edwin Zhou
            Reporter:
            Wernfried Domscheit
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              Created:
              Updated:
              Resolved: