2018-08-30T09:43:05.816-0400 I SHARDING [Balancer] moving chunk ns: tmfp_filestore.fs.chunks moving ( ns: tmfp_filestore.fs.chunks, shard: rs0, lastmod: 22835|0||531eb8b040637ded654fafd6, min: { files_id: MinKey, n: MinKey }, max: { files_id: ObjectId('52cef753f0f02940a3611d7f'), n: 0 }) rs0 -> rs1
2018-08-30T09:43:05.936-0400 I SHARDING [Balancer] moveChunk result: { cause: { ok: 0.0, errmsg: "can't accept new chunks because there are still 1212 deletes from previous migration" }, ok: 0.0, errmsg: "moveChunk failed to engage TO-shard in the data transfer: :: caused by :: UnknownError: can't accept new chunks because there are still 1212 deletes...", code: 8 }

Please check this and let me know for a solution. Thanks in advance