code: public void setConfigurations(java.util.Collection<Configuration> configurations) {
          if (configurations == null) {
              this.configurations = null;
              return;
          }
  
          this.configurations = new com.amazonaws.internal.SdkInternalList<Configuration>(configurations);
      }
docs: <note>
  <p>
  Amazon EMR releases 4.x or later.
  </p>
  </note>
  <p>
  The list of configurations supplied for an EMR cluster instance group. You can specify a separate configuration
  for each instance group (master, core, and task).
  </p>
  
  @param configurations
  <p>
  Amazon EMR releases 4.x or later.
  </p>
  </note>
  <p>
  The list of configurations supplied for an EMR cluster instance group. You can specify a separate
  configuration for each instance group (master, core, and task).