code: @Override
      public UpdateGlobalTableResult updateGlobalTable(UpdateGlobalTableRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateGlobalTable(request);
      }
docs: <p>
  Adds or removes replicas in the specified global table. The global table must already exist to be able to use
  this operation. Any replica to be added must be empty, must have the same name as the global table, must have the
  same key schema, and must have DynamoDB Streams enabled and must have same provisioned and maximum write capacity
  units.
  </p>
  <note>
  <p>
  Although you can use <code>UpdateGlobalTable</code> to add replicas and remove replicas in a single request, for
  simplicity we recommend that you issue separate requests for adding or removing replicas.
  </p>
  </note>
  <p>
  If global secondary indexes are specified, then the following conditions must also be met:
  </p>
  <ul>
  <li>
  <p>
  The global secondary indexes must have the same name.
  </p>
  </li>
  <li>
  <p>
  The global secondary indexes must have the same hash key and sort key (if present).
  </p>
  </li>
  <li>
  <p>
  The global secondary indexes must have the same provisioned and maximum write capacity units.
  </p>
  </li>
  </ul>
  
  @param updateGlobalTableRequest
  @return Result of the UpdateGlobalTable operation returned by the service.
  @throws InternalServerErrorException
  An error occurred on the server side.
  @throws GlobalTableNotFoundException
  The specified global table does not exist.
  @throws ReplicaAlreadyExistsException
  The specified replica is already part of the global table.
  @throws ReplicaNotFoundException
  The specified replica is no longer part of the global table.
  @throws TableNotFoundException
  A source table with the name <code>TableName</code> does not currently exist within the subscriber's
  account.
  @sample AmazonDynamoDB.UpdateGlobalTable
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/dynamodb-2012-08-10/UpdateGlobalTable" target="_top">AWS API
  Documentation</a>