Elasticsearch Client new version 8.1 how to request a search - api

Question

Just struggelin with the new Elastic version 8.1 cause have no idea how to migrate a simple serch into the new api:
The old approach:
...
final BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
boolQuery.must(QueryBuilders.matchQuery("name", "Paul"));
final SearchRequest searchRequest = new SearchRequest("/myIndex");
searchRequest.searchType(SearchType.DEFAULT).source(searchSourceBuilder);
final SearchResponse sr = client.search(searchRequest, RequestOptions.DEFAULT);
...
This was straight forward. Could find out the hits etc. from the response and everything worked fine.
But with the new approach i cannot handle the searchrequest as it was before:
final SearchResponse<TDocument> sr1 = client.search(searchRequest, Class<TDocument> tDocumentClass);
For what is the TDocument type needed and how to define my model that it will fit into the API?

Answer 1

After going deeper into some tutorials i finally find a solution for a simple problem. See:
final Query query = new Query.Builder().term(t -> t.field("field_looking_for").value(v -> v.stringValue("value_looking_for"))).build();
final Query bool_query = new Query.Builder().bool(t -> t.must(query)).build();
try {
final SearchResponse<ChannelDto> result = client.search(s -> s.query(bool_query).index(INDEX).size(100), Dto.class);
if (!result.hits().hits().isEmpty()) {
for (final Hit<Dto> data_result : result.hits().hits()) {
Dto dto = data_result.source();
return dto;
}
}
} catch (ElasticsearchException | IOException e) {
throw new NoDataException("IO Exception", e);
}