CODEWITHSUNDEEP
javaelasticsearchmorelikethis
amachado
amachado

Reputation: 1040

Elasticsearch similar documents in Java

I'm doing a website (an auction website) using java. I have one page to show the product in auction and I want to show 10 similar products.

To perform the search I'm using elasticsearch (by using the elasticsearch java implementation dadoonet).

One requirement I have is to show only the 10 similar documents that has date > now.

I say the elasticsearch documentation and I found the query "More like this" but first I'm not getting this to work using:

new MoreLikeThisRequest("auction").searchSize(size).id(productId + "").fields(new String[] { "name", "description", "brand" }).type("string");

Because is always showing the error:

org.elasticsearch.index.engine.DocumentMissingException: [_na][_na] [string][2]: document missing

And I'm not find the way to filter the date.

Someone can point me on the right way to do this?

thks

Upvotes: 0

Views: 1106

Answers (2)

amachado
amachado

Reputation: 1040

So after strugling a little bit I found someone with the same problem. So his suggestion was to set the min_term_freq to 1.

So the code now looks like this:

FilteredQueryBuilder queryBuilder = new FilteredQueryBuilder(QueryBuilders.matchAllQuery(), FilterBuilders.rangeFilter("finish_date").lt("now"));
        SearchSourceBuilder query = SearchSourceBuilder.searchSource().query(queryBuilder);
        SearchResponse response = esClient.prepareMoreLikeThis("auction", "product", productId + "").setField("name.name", "description", "brand").setPercentTermsToMatch(0.3f)
                .setMinTermFreq(1).setSearchSource(query).execute().actionGet();

But I dont know what this MinTermFreq does and if the value 1 is the right value. Someone know what is this field?

Thks for all the help!

Once again, Thank you for all the help and sorry for all the trouble!

Upvotes: 0

Jettro Coenradie
Jettro Coenradie

Reputation: 4733

My best bet would be that you have the wrong id and I also see that you are missing the type. To use more like this, you have to provide the document to use. This is defined by the combination of index,type and id. If you do not specify the document right, elasticsearch cannot find the document and that is most probably why you get the document missing message.

In java I would do something like this:

FilteredQueryBuilder queryBuilder = 
        new FilteredQueryBuilder(
                QueryBuilders.matchAllQuery(),
                FilterBuilders.rangeFilter("datefield").lte("now")
        );
SearchSourceBuilder query = SearchSourceBuilder.searchSource().query(queryBuilder);

client.prepareMoreLikeThis("index","type","id")
    .setField("field1","field2")
    .setSearchSource(query)
    .execute().actionGet();

Upvotes: 2

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