@java.lang.Override
  public com.google.cloud.vertexai.api.RagRetrievalConfig.FilterOrBuilder getFilterOrBuilder() {
    return filter_ == null
        ? com.google.cloud.vertexai.api.RagRetrievalConfig.Filter.getDefaultInstance()
        : filter_;
  }
<pre>
Optional. Config for filters.
</pre>

<code>
.google.cloud.vertexai.v1.RagRetrievalConfig.Filter filter = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/RagRetrievalConfig.java