Elasticsearch arrays of string query based on array index

Question

I have Elasticsearch documents which looks like below :

MetaData metadata,
... many other properties...

MetaData class :

public class MetaData {
private List<String> keywords;
}

Now I want to build a query which match the provided string to the metadata.keywords's 0 index.

Code example : metadata.keywords[0] equals to input string

What I have done is below :

BoolQueryBuilder query = QueryBuilders.boolQuery();
query.must(QueryBuilders.existsQuery("metadata.keywords"));

How can I specify the index to do the same?

Abacus · Accepted Answer · 2021-08-09 18:08:50Z

0

For Elasticsearch, arrays are like multivalue fields where the order of the values is not relevant, so there is no explicit search on an index position like [0].

You might check this answer (Elasticsearch query on array index) if this approach works for you (try the query out manually with some REST client). If it does, you will need to build the query with this filters using the NativeSearchQueryBuilder from Spring Data Elasticsearch - although I cannot guarantee that all necessary operations are available.

answered Aug 9, 2021 at 18:08

Abacus

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