Querying dense_vector from the High Level REST Java API

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1

All the examples I can find for querying dense vector mention script queries, eg. Searching with Dense Vector
However, I have no idea on how to use those with the HL API.
Is this possible at all and if yes then can you ES wizards give an example?

2

You can use QueryBuilders.scriptScoreQuery() and create a script score query with that and then execute a search? is that what you are after?

1 Like
3

That's it, however I would appreciate an example on how to translate the example vector query from the docs to the Java HL REST API. I haven't been able to find one for Java, although there are examples for other languages.

{
  "size" : 5,
  "query": {
    "script_score": {
      "query" : {
        "match_all" : {}
      },
      "script": {
        "source": "cosineSimilarity(params.queryVector, title_vector) + 1.0",
        "params": {
          "title_vector": [1,2,3]
        }
      }
    }
  }
}
4

Update
trying the approach shown here although I'd prefer to use just the Java API https://discuss.elastic.co/t/cannot-set-up-script-score-for-dense-vector-using-java-rest-api/238849/3. This gets executed but all scores are 1.0 - only the match_all query gets executed. What I'm doing wrong?

  SearchTemplateRequest request = new SearchTemplateRequest();
    request.setRequest(searchRequest);
    request.setScriptType(ScriptType.INLINE);


    def script =
            "{ \"query\":   " +
                    "{" +
                    "    \"script_score\": {       " +
                    "        \"query\": { " +
                    "           \"query_string\" : { " +
                    "               \"query\" : \"" + "match_all" + "\", " +
                    "                : \"{}\" " +
                    "            }  " +
                    "        },   " +
                    "        \"script\": { " +
                    "            \"source\": \"cosineSimilarity( " + vectors+ ",'title_vector') + 1.0\"  " +
                    "        } " +
                    "    }  " +
                    "}" +
                    "}  ";
    request.setScript(script);
    SearchResponse s = elastic.search(request.getRequest(), RequestOptions.DEFAULT)
5

Duh - there is an searchTemplate option. Using it however gives error
[search_template] params doesn't support values of type: VALUE_NULL"}],"type":"x_content_parse_exception",

The error persists even if I add script params in the request and it's barely mentioned on the web - what's happening?

6

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