public com.google.cloud.vertexai.api.Schema.Builder putPropertiesBuilderIfAbsent(
        java.lang.String key) {
      java.util.Map<java.lang.String, com.google.cloud.vertexai.api.SchemaOrBuilder> builderMap =
          internalGetMutableProperties().ensureBuilderMap();
      com.google.cloud.vertexai.api.SchemaOrBuilder entry = builderMap.get(key);
      if (entry == null) {
        entry = com.google.cloud.vertexai.api.Schema.newBuilder();
        builderMap.put(key, entry);
      }
      if (entry instanceof com.google.cloud.vertexai.api.Schema) {
        entry = ((com.google.cloud.vertexai.api.Schema) entry).toBuilder();
        builderMap.put(key, entry);
      }
      return (com.google.cloud.vertexai.api.Schema.Builder) entry;
    }
<pre>
Optional. SCHEMA FIELDS FOR TYPE OBJECT
Properties of Type.OBJECT.
</pre>

<code>
map&lt;string, .google.cloud.vertexai.v1.Schema&gt; properties = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Schema.java