@java.lang.Override
  public boolean hasGcsSource() {
    return importSourcesCase_ == 23;
  }
<pre>
Optional. Immutable. Backups that stored in Cloud Storage buckets.
The Cloud Storage buckets need to be the same region as the instances.
Read permission is required to import from the provided Cloud Storage
Objects.
</pre>

<code>
.google.cloud.memorystore.v1.Instance.GcsBackupSource gcs_source = 23 [(.google.api.field_behavior) = OPTIONAL, (.google.api.field_behavior) = IMMUTABLE];
</code>

@return Whether the gcsSource field is set.
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Instance.java