[BUG] Indices with a PathHierarchyTokenizer without optional config params cannot be deserialized

What is the bug?

An index with a path hierarchy tokenizer that is configured with missing optional parameters (see https://docs.opensearch.org/latest/analyzers/tokenizers/path-hierarchy/) cannot be deserialized with an error.
E.g. Missing required property 'PathHierarchyTokenizer.bufferSize'

How can one reproduce the bug?

• Create a index with path hierarchy tokenizer without setting optional parameters
• Try to retrieve this index using the IndicesClient

What is the expected behavior?

Index should be retrieved without throwing an exception

What is your host/environment?

OS 2.19.3
Client 3.2.0 / 3.3.0

Do you have any screenshots?

java.lang.RuntimeException: Missing required property 'PathHierarchyTokenizer.bufferSize'
	at org.opensearch.client.transport.httpclient5.ApacheHttpClient5Transport.extractAndWrapCause(ApacheHttpClient5Transport.java:1168)
	at org.opensearch.client.transport.httpclient5.ApacheHttpClient5Transport.performRequest(ApacheHttpClient5Transport.java:159)
	at org.opensearch.client.opensearch.indices.OpenSearchIndicesClientBase.get(OpenSearchIndicesClientBase.java:468)

Do you have any additional context?

Caused by requireNonNull checks in PathHierarchyTokenizer for optional parameters

    private PathHierarchyTokenizer(Builder builder) {
        super(builder);
        this.bufferSize = ApiTypeHelper.requireNonNull(builder.bufferSize, this, "bufferSize");
        this.delimiter = ApiTypeHelper.requireNonNull(builder.delimiter, this, "delimiter");
        this.replacement = builder.replacement;
        this.reverse = ApiTypeHelper.requireNonNull(builder.reverse, this, "reverse");
        this.skip = ApiTypeHelper.requireNonNull(builder.skip, this, "skip");
    }

Start with the PathHierarchyTokenizer model and the IndicesClient retrieval path shown in the report, then inspect how tokenizer responses are deserialized and where the requireNonNull checks are applied. Reproduce the issue by retrieving an index whose path hierarchy tokenizer omits optional parameters; done means the index is retrieved without the missing-property exception.