Weird methods in ElasticsearchClient

There are methods in `ElasticsearchClient` that look like not very useful.

They do not take any parameter, therefore using the builder internally without setting any value. When called, they raise an `IllegalStateException`.

Examples
- [public BulkResponse bulk()](https://github.com/elastic/elasticsearch-java/blob/e6d2abe7b98135b5885c218ef0c7e55cb8f93ac1/java-client/src/main/java/co/elastic/clients/elasticsearch/ElasticsearchClient.java#L339-L342)
- [public MtermvectorsResponse mtermvectors()](https://github.com/elastic/elasticsearch-java/blob/e6d2abe7b98135b5885c218ef0c7e55cb8f93ac1/java-client/src/main/java/co/elastic/clients/elasticsearch/ElasticsearchClient.java#L1138-L1141)
- [public FieldCapsResponse fieldCaps()](https://github.com/elastic/elasticsearch-java/blob/e6d2abe7b98135b5885c218ef0c7e55cb8f93ac1/java-client/src/main/java/co/elastic/clients/elasticsearch/ElasticsearchClient.java#L800-L803)
- [public ReindexResponse reindex()](https://github.com/elastic/elasticsearch-java/blob/e6d2abe7b98135b5885c218ef0c7e55cb8f93ac1/java-client/src/main/java/co/elastic/clients/elasticsearch/ElasticsearchClient.java#L1306-L1309)
- [public RenderSearchTemplateResponse renderSearchTemplate()](https://github.com/elastic/elasticsearch-java/blob/e6d2abe7b98135b5885c218ef0c7e55cb8f93ac1/java-client/src/main/java/co/elastic/clients/elasticsearch/ElasticsearchClient.java#L1389-L1392)

Looking at the API documentation, there is a least some mandatory parameter.

Is this maybe the result of generating the client based on the API specification and they should better be removed?