# Is possible to use Lucene queries with ElasticSearch?
**URL:** https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617
**Category:** Hibernate Search
**Created:** [August 31, 2022, 7:58am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617 "2022-08-31T07:58:13Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Monkiki](https://discourse.hibernate.org/u/Monkiki)
#### Post date: [August 31, 2022, 7:58am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617/1 "2022-08-31T07:58:13Z")
According to the documentation ElasticSearch queries are in JSON format like this:
```auto
{"wildcard":{"name":"temple*"}}
```
In Lucene it would be:
```auto
+name:temple*
```
But I wonder if it’s possible to use a Lucene query directly, or if there is any sort of “query converter” implemented in HIbernate Search 6.
Thanks in advance.
---
### Author:  [@yrodiere](https://discourse.hibernate.org/u/yrodiere)
#### Post date: [August 31, 2022, 8:06am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617/2 "2022-08-31T08:06:17Z")
> [@Monkiki](#):
>
> I wonder if it’s possible to use a Lucene query directly
You cannot use an instance of `org.apache.lucene.search.Query` with the Elasticsearch backend, no.
You can pass a query string with the Lucene syntax to Elasticsearch, though:
- either with the [`simpleQueryString` predicate](https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#search-dsl-predicate-simple-query-string) (it offers a different syntax from your example)
- or with a [native Elasticsearch predicate](https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#search-dsl-predicate-extensions-elasticsearch-from-json) where you’ll pass the JSON for the [`queryString` query](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html). We will add an API for that predicate in Hibernate Search at some point, but that’s not implemented yet ([[HSEARCH-4563] - Hibernate JIRA](https://hibernate.atlassian.net/browse/HSEARCH-4563)).
> [@Monkiki](#):
>
> if there is any sort of “query converter” implemented in HIbernate Search 6.
There is not, and there never will be. We tried that in Hibernate Search 5 and it was a nightmare to maintain. 0/10, won’t do it again.
---
### Author:  [@Monkiki](https://discourse.hibernate.org/u/Monkiki)
#### Post date: [August 31, 2022, 8:28am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617/3 "2022-08-31T08:28:12Z")
I was able to make the query using this code, which makes use of [query string query](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html):
```auto
String query = "{\"query_string\":{\"query\":\"+name:temple*\"}}";
SearchResult result = seSession.search(MyEntity.class)
.extension(ElasticsearchExtension.get())
.where(f -> f.fromJson(query))
.fetch(20);
```
The [`simpleQueryString` predicate](https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#search-dsl-predicate-simple-query-string) is interesting, but I need to filter by several fields and values. I’ve seen I can filter by several fields ([Targeting multiple fields in one predicate](https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#search-dsl-predicate-common-multiple-fields)) but with the same value.
It would be nice to expand the `simpleQueryString` syntax to allow more powerful searches.
Thanks!
---
### Author:  [@yrodiere](https://discourse.hibernate.org/u/yrodiere)
#### Post date: [August 31, 2022, 8:32am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617/4 "2022-08-31T08:32:19Z")
> [@Monkiki](#):
>
> `String query = "{\"query_string\":{\"query\":\"+name:temple*\"}}";`
Just be careful about concatenating strings that contain user input: you expose yourself to injection vulnerabilities.
It’s way safer to use a JSON library to build objects and then render them as a JSON string. See for example `JsonObject` in GSON.
---
### Author:  [@Monkiki](https://discourse.hibernate.org/u/Monkiki)
#### Post date: [August 31, 2022, 9:34am UTC](https://discourse.hibernate.org/t/is-possible-to-use-lucene-queries-with-elasticsearch/6617/5 "2022-08-31T09:34:00Z")
I already clean user input, but thanks anyway.
Best regards.