public Builder clearMaintenancePolicy() {
      bitField0_ = (bitField0_ & ~0x04000000);
      maintenancePolicy_ = null;
      if (maintenancePolicyBuilder_ != null) {
        maintenancePolicyBuilder_.dispose();
        maintenancePolicyBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Optional. The maintenance policy for the instance. If not provided,
the maintenance event will be performed based on Memorystore
internal rollout schedule.
</pre>

<code>
.google.cloud.memorystore.v1.MaintenancePolicy maintenance_policy = 31 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Instance.java