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Trying to merge chunks using the following command:

         db.adminCommand

         ( {

           mergeChunks: "HTMLDumps.HTMLRepository",

           bounds: [ {   "ShardMapId" : 2, "DomainId" : 62 },

           {  "ShardMapId" : 2, "DomainId" : 162 } ]

         } )

getting the following error when trying to run the above command to try to merge any of the available consecutive chunks available on a shard:

             {

             "ok" : 0,

             "errmsg" : "Failed to commit chunk merge :: caused by :: 

             DuplicateKey: chunk operation commit failed: version 

             32|6||5ba8d864bba4ff264edf0bd9 doesn't exist in 

             namespace: HTMLDumps.HTMLRepository. Unable to save 

             chunk ops. Command: { applyOps: [ { op: "u", b: false, 

             ns: "config.chunks", o: { _id: "HTM 

             Dumps.HTMLRepository-ShardMapId_2.0DomainId_62.0", ns: 

             "HTMLDumps.HTMLRepository", min: { ShardMapId: 2.0, 

             DomainId: 62.0 }, max: { ShardMapId: 2, DomainId: 162 }, 

             shard: "shard0000", lastmod: Timestamp(32, 6), 

             lastmodEpoch: ObjectId('5ba8d864bba4ff264edf0bd9') }, 

             o2: { _id: "HTMLDumps.HTMLRepository- 

             ShardMapId_2.0DomainId_62.0" } }, { op: "d", ns: 

             "config.chunks", o: { _id: "HTMLDumps.HTMLRepository- 

             ShardMapId_2DomainId_109" } } ], preCondition: [ { ns: 

             "config.chunks", q: { query: { ns: 

             "HTMLDumps.HTMLRepository", min: { ShardMapId: 2.0, 

             DomainId: 62.0 }, max: { ShardMapId: 2, DomainId: 109 } 

             }, orderby: { lastmod: -1 } }, res: { lastmodEpoch: 

             ObjectId('5ba8d864bba4ff264edf0bd9'), shard: 

             "shard0000" } }, { ns: "config.chunks", q: { query: 

             { ns: "HTMLDumps.HTMLRepository", min: { ShardMapId: 

             2, DomainId: 109 }, max: { ShardMapId: 2, DomainId: 162 

             } }, orderby: { lastmod: -1 } }, res: { lastmodEpoch: 

             ObjectId('5ba8d864bba4ff264edf0bd9'), shard: 

             "shard0000" } } ], writeConcern: { w: 0, wtimeout: 0 } 

             }. Result: { applied: 1, code: 11000, codeName: 

             "DuplicateKey", errmsg: "E11000 duplicate key error 

             collection: config.chunks index: ns_1_min_1 dup key: { : 

             "HTMLDumps.HTMLRepository", : { ShardMapId: 2.0, 

             DomainId: 62.0 } }", results: [ false ], ok: 0.0, 

             operationTime: Timestamp(1554112692, 1), $gleStats: { 

             lastOpTime: { ts: Timestamp(1554112692, 1), t: 13 },  

             electionId: ObjectId('7fffffff000000000000000d') }, 

             $clusterTime: { clusterTime: Timestamp(1554112692, 1), 

             signature: { hash: BinData(0, 

             0000000000000000000000000000000000000000), keyId: 0 } } 

             } :: caused by :: E11000 duplicate key error collection: 

             config.chunks index: ns_1_min_1 dup key: { : 

             "HTMLDumps.HTMLRepository", : { ShardMapId: 2.0, 

             DomainId: 62.0 } }",

             "code" : 11000,

             "codeName" : "DuplicateKey",

             "operationTime" : Timestamp(1554112687, 1),

             "$clusterTime" : {

             "clusterTime" : Timestamp(1554112687, 1),

             "signature" : {

                "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),

                "keyId" : NumberLong(0)

               }

              }

             }

This is happening regardless of which chunks i select. Main reason for me to try to do this is to achieve true data balancing and not just chunk numbers. Recently developers deleted 90% of the data from these chunks that caused the distribution to get to 90% 10% state from 60/40 earlier. I hope to merge/remove empty chunks to ensure balancing of the data to reach as close to 60/40 as possible.