"filtered query does not support sort" when using Hibernate Search - sorting

Question

I'm trying to issue a query which includes sorting
from Hibernate Search 5.7.1.Final
to ElasticSearch 2.4.2.
When I'm using curl I get the results:
curl -XPOST 'localhost:9200/com.example.app.model.review/_search?pretty' -d '
{
"query": { "match" : { "authors.name" : "Puczel" } },
"sort": { "title": { "order": "asc" } }
}'
But when I issue the query from code:
protected static Session session;
public static void prepareSession()
{
SessionFactory sessionFactory = new Configuration().configure()
.buildSessionFactory();
session = sessionFactory.openSession();
}
...
protected static void testJSONQueryWithSort()
{
FullTextSession fullTextSession = Search.getFullTextSession(session);
QueryDescriptor query = ElasticsearchQueries.fromJson(
"{ 'query': { 'match' : { 'authors.name' : 'Puczel' } }, 'sort': { 'title': { 'order': 'asc' } } }");
List<?> result = fullTextSession.createFullTextQuery(query, Review.class).list();
System.out.println("\n\nSearch results for 'author.name:Puczel':");
for(Object object : result)
{
Review review = (Review) object;
System.out.println(review.toString());
}
}
I get an Exception:
"[filtered] query does not support [sort]"
I understand where it comes from, because the query
that Hibernate Search issues is different than my curl query
- specifying the type is realised differently:
{
"query":
{
"filtered":
{
"query":
{
"match":{"authors.name":"Puczel"}
},
"sort":{"title":{"order":"asc"}},
"filter":{"type":{"value":"com.example.app.model.Review"}}
}
}
}
But I don't know how to change it.
I tried using the sort example from Hibernate documentation:
https://docs.jboss.org/hibernate/search/5.7/reference/en-US/html_single/#__a_id_elasticsearch_query_sorting_a_sorting
But the example is not full. I don't know:
which imports to use (there are multiple matching),
what are the types of the undeclared variables, like s,
how to initalise the variable luceneQuery.
I will appreciate any remarks on this.

Answer 1

Yes, as mentioned in the javadoc of org.hibernate.search.elasticsearch.ElasticsearchQueries.fromJson(String):
Note that only the 'query' attribute is supported.
So you must use the Hibernate Search API to perform sorts.
which imports to use (there are multiple matching),
Sort is the one from Lucene (org.apache.lucene), List is from java.util, and all the other imports should be from Hibernate Search (org.hibernate.search).
what are the types of the undeclared variables, like s
s is a FullTextSession retrieved through org.hibernate.search.Search.getFullTextSession(Session). It will also work with a FullTextEntityManager retrieved through org.hibernate.search.jpa.Search.getFullTextEntityManager(EntityManager).
how to initalise the variable luceneQuery
You'll have to use the query builder (qb):
Query luceneQuery = qb.keyword().onField("authors.name").matching("Puczel").createQuery();
If you intend to use the Hibernate Search API, and you're not comfortable with it yet, I'd recommend reading the general documentation first (not just the Elasticsearch part, which only mentions Elasticsearch specifics): https://docs.jboss.org/hibernate/search/5.7/reference/en-US/html_single/#search-query