public Builder setOrchestrationCluster(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      orchestrationCluster_ = value;
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Immutable. Reference to the orchestration cluster on which templates for
this resources will be applied. This should be of format
projects/{project}/locations/{location}/orchestrationClusters/{orchestration_cluster}.
</pre>

<code>
string orchestration_cluster = 5 [(.google.api.field_behavior) = IMMUTABLE, (.google.api.resource_reference) = { ... }
</code>

@param value The orchestrationCluster to set.
@return This builder for chaining.
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/EdgeSlm.java