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Steps To Reproduce:

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(function() {

"use strict";

const st = new ShardingTest({shards: 1, mongos: 1, rs: {nodes: 1}});

const mongosDB = st.s0.getDB(jsTestName());

const mongosColl = mongosDB[jsTestName()];

assert.commandWorked(mongosColl.insert({_id: 1}));

// Should not be OK.

assert.commandWorked(mongosDB.runCommand(

    {setIndexCommitQuorum: jsTestName(), indexNames: ["abcd"], commitQuorum: 1}));

// Mongos should fail with this error code too.

let replTest = st.rs0;

assert.commandFailedWithCode(

    replTest.getPrimary()

        .getDB(jsTestName())

        .runCommand({setIndexCommitQuorum: jsTestName(), indexNames: ["abcd"], commitQuorum: 1}),

    ErrorCodes.IndexNotFound);

st.stop();

}());

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I tried to run setIndexCommitQuorum against a mongos on a non-existent index build and the command returns successfully:

       "ok" : 1,

       "$clusterTime" : {

               "clusterTime" : Timestamp(1620827363, 2),

               "signature" : {

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

                       "keyId" : NumberLong(0)

},

       "operationTime" : Timestamp(1620827363, 2)

Running the same command against the primary mongod returns the expected result:

       "ok" : 0,

       "errmsg" : "Cannot find an index build on collection 'repro.repro' with the provided index names",

       "code" : 27,

       "codeName" : "IndexNotFound",

       "$gleStats" : {

               "lastOpTime" : {

                       "ts" : Timestamp(1620827362, 16),

                       "t" : NumberLong(1)

},

               "electionId" : ObjectId("7fffffff0000000000000001")

},

       "lastCommittedOpTime" : Timestamp(1620827363, 2),

       "$configServerState" : {

               "opTime" : {

                       "ts" : Timestamp(1620827362, 22),

                       "t" : NumberLong(-1)

},

       "$clusterTime" : {

               "clusterTime" : Timestamp(1620827363, 2),

               "signature" : {

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

                       "keyId" : NumberLong(0)

},

       "operationTime" : Timestamp(1620827363, 2)