Elasticsearch: send JSON query string via Java client?

Question

I am new to Elasticsearch. I read Elasticsearch's Java client APIs and am able to build query and send it to the Elasticsearch server via the transport client.

Because my query is quite complex with multi-level filters and I notice that it is cumbersome to build a query via the Java client. I feel that it is much simpler to build a JSON query string and then send it over to the Elasticsearch server via a Java client.

Is this something Elasticsearch offers?

I do like what Elasticsearch Java API can do after receiving results such as scrolling over the results. I want to keep these features.

Thanks for any input and links!

Regards.

Saeed Zhiany · Accepted Answer · 2016-12-21 09:15:23Z

9

Did further research on Elasticsearch API and found out that Elasticsearch does offer this capability. Here is how:

SearchResponse scrollResp = client.prepareSearch("my-index")
        .setTypes("my-type")
        .setSearchType(SearchType.SCAN)
        .setQuery(query) // **<-- Query string in JSON format**
        .execute().actionGet();

edited Dec 21, 2016 at 9:15

Saeed Zhiany

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answered Jul 22, 2014 at 23:51

curious1

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2 Comments

MicNeo Over a year ago

I just want to thanks for "<-- Query string in JSON format" comment :)

Giftiger Wunsch Over a year ago

SearchType.SCAN is no longer part of the API (at least not in 5.1.2, which is what I'm currently using)

Joy Foster · Accepted Answer · 2017-03-03 00:45:03Z

3

You can no longer pass in string to the .setQuery function, however you can use a WrapperQueryBuilder like this:

WrapperQueryBuilder builder = QueryBuilders.wrapperQuery(searchQuery);
SearchRequestBuilder sr = client.prepareSearch().setIndices(index).setTypes(mapping).setQuery(builder);

answered Mar 3, 2017 at 0:45

Joy Foster

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Comments

Dan Tuffery · Accepted Answer · 2014-07-23 10:29:38Z

1

I'd recommend using the Java API, it is very good once you get used to it and in most cases it is less cumbersome. If you look through the Elasticsearch source code you will see that the Java API Builds the JSON under the hood. Here is an example from the MatchAllQueryBuilder:

@Override
public void doXContent(XContentBuilder builder, Params params) throws IOException {
    builder.startObject(MatchAllQueryParser.NAME);
    if (boost != -1) {
        builder.field("boost", boost);
    }
    if (normsField != null) {
        builder.field("norms_field", normsField);
    }
    builder.endObject();
}

edited Jul 23, 2014 at 10:29

answered Jul 23, 2014 at 10:22

Dan Tuffery

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1 Comment

R. van Twisk Over a year ago

This doesn't answer the question.

Johannes Jander · Accepted Answer · 2016-03-11 13:15:17Z

1

ElasticSearch has built in capabilities to do exactly what you need, in an organized manner.

To answer your question, please see this link (the material is gone on elastic's site, so it might no longer work):

https://web.archive.org/web/20150906215934/https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/search.html

All you have to do is build a simple file which contains your search template i.e complex search query. It can be a simple json file, or a text file.

Now you simply pass in your parameters, through your java code. See the example in the link, it makes things amply clear.

Bhargav.

edited Mar 11, 2016 at 13:15

Johannes Jander

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answered Dec 20, 2014 at 14:47

Algorini

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