@java.lang.Override
  public boolean hasZoneDistributionConfig() {
    return ((bitField0_ & 0x00000040) != 0);
  }
<pre>
Optional. Immutable. Zone distribution configuration of the instance for
node allocation.
</pre>

<code>
.google.cloud.memorystore.v1beta.ZoneDistributionConfig zone_distribution_config = 18 [(.google.api.field_behavior) = OPTIONAL, (.google.api.field_behavior) = IMMUTABLE];
</code>

@return Whether the zoneDistributionConfig field is set.
java-valkey/proto-google-cloud-valkey-v1beta/src/main/java/com/google/cloud/memorystore/v1beta/Instance.java