createMutation.kt

 //Create a mutation object
 val mutation = UpdateCurrentTaskMutation.builder().id(id).title(title).version(version).build()

 //Create an object of apolloCall
 val client = apolloClient.mutate(mutation)?.refetchQueries(apolloQueryWatcher?.operation()?.name())

  //Create a callback object of type ResponseCallback
  val customCallback = object : ResponseCallback {
       override fun onSuccess(response: Response<Any>) {
           //Perform UI bindings accordingly.
  }
 
  /* Called when the request could not be executed due to cancellation, a connectivity problem or timeout.
   */      
       override fun onSchedule(e: ApolloException, mutation: Mutation<Operation.Data, Any, Operation.Variables>) {
          e.printStackTrace()
          //Perferm local UI Bindings
       }
 }

  /*Call the enqueue function on ApolloClient and pass in two parameters :
   1. mutation object typecasted as mutation as 
      com.apollographql.apollo.api.Mutation<Operation.Data, Any, Operation.Variables>                 
   2. customCallback
   */  
    apolloClient.enqueue(
        mutation as com.apollographql.apollo.api.Mutation<Operation.Data, Any, Operation.Variables>,
        customCallback
    )