Add a case to accept to hide an index if it is not compatible with shard key

Set up a sharded cluster with primary nodes at v5.0 a secondary nodes at 6.0.   const mongos = st.s; const ns = "test.foo" ; const db = mongos.getDB( "test" ); const coll = db.getCollection( "foo" );     st.adminCommand({enablesharding:db.getName(), primaryShard:st.shard1.shardName}); st.adminCommand({shardcollection:ns, key: {skey: 1 }});   assert .commandWorked(coll.dropIndexes()); assert .commandWorked(coll.createIndex({ "a" : 1 })); assert .commandWorked(coll.hideIndex( "a_1" ));