ElasticSearch full text search using Java API

Question

I've recently started exploring the world of search, and am trying to use ES as the index for my MongoDB. I've managed to integrate them successfully, but I find the search API rather complex and confusing. The Java API is not too helpful either. I am able to find exact matches, but how do I do full-text searches? Here is my code:

Settings settings = ImmutableSettings.settingsBuilder()
    .put("cluster.name", "elasticsearch").build();
Client client = new TransportClient(settings)
    .addTransportAddress(new InetSocketTransportAddress("host-ip", 9300));
SearchResponse response = client.prepareSearch("mongoindex")
    .setSearchType(SearchType.QUERY_AND_FETCH)
    .setQuery(termQuery("name", "*name*"))
    .setFrom(0).setSize(60).setExplain(true)
    .execute()
    .actionGet();

I have no problems finding "name":"testname" using .setQuery(termQuery("name", "testname")), but "name":"this is a test name" doesn't work with the above example. What am I doing wrong?

that's just the database that i'm using.

Wei Hao
– Wei Hao

2013-01-12 20:12:45 +00:00
Commented Jan 12, 2013 at 20:12 — Wei Hao
– Wei Hao, Commented Jan 12, 2013 at 20:12

Wei Hao · Accepted Answer · 2013-01-14 08:26:42Z

8

After crawling the Internet for hours, I've managed to figure it out, with some help from the javadocs. The most important is the interface *QueryBuilder*, and its implementing classes. I used FieldQueryBuilder for my query, which in shown in the setQuery method below.

SearchResponse response = client.prepareSearch("mongoindex")
    .setSearchType(SearchType.QUERY_AND_FETCH)
    .setQuery(fieldQuery("name", "test name"))
    .setFrom(0).setSize(60).setExplain(true)
    .execute()
    .actionGet();
SearchHit[] results = response.getHits().getHits();
for (SearchHit hit : results) {
  System.out.println(hit.getId());    //prints out the id of the document
  Map<String,Object> result = hit.getSource();   //the retrieved document
}

With the resulting Map object, you can simply call the get method to retrieve the relevant data.

answered Jan 14, 2013 at 8:26

Wei Hao

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Comments

mjhm · Accepted Answer · 2013-01-12 21:51:10Z

0

It looks like termQuery in elasticsearch uses Lucence for it's search syntax. According to the Lucene docs the "*" wildcard is not allowed as the first term of a search.

answered Jan 12, 2013 at 21:51

mjhm

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4 Comments

Wei Hao Over a year ago

if that is the case, how could i search for a phrase (or substring) within text?

mjhm Over a year ago

I would guess using a query_string elasticsearch.org/guide/reference/query-dsl/…

Wei Hao Over a year ago

Unfortunately, that is not in Java, which is really the crux of my question, as I am using the Java API. I've seen the link but I can't translate it into Java.

mjhm Over a year ago

Here's the source: github.com/elasticsearch/elasticsearch/blob/master/src/main/…

Arepalli Praveenkumar · Accepted Answer · 2014-07-13 18:55:13Z

0

Better to look at [wildcard Query] (http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-wildcard-query.html)

answered Jul 13, 2014 at 18:55

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