public final int getNumber() {
      if (this == UNRECOGNIZED) {
        throw new java.lang.IllegalArgumentException(
            "Can't get the number of an unknown enum value.");
      }
      return value;
    }
<pre>
Struct type.
- SearchStrategy:
  * Data Schema that's CUSTOMIZED_STRUCT cannot set search strategy.
  * Leaf-node elements allow setting search strategy based on element's
    SearchStrategy restriction.
- Nested layer restrictions:
  * Data Schema that's CUSTOMIZED_STRUCT allows its fields to be of
    CUSTOMIZED_STRUCT as well, but the overall layers restriction is 10.
</pre>

<code>CUSTOMIZED_STRUCT = 6;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/DataSchemaDetails.java