OpenSearch is a text-based search engine based on lucene in which we can store and query data effectively.
It provides a Java SDK client that helps to access OpenSearch through Java application.
Range query allows us to query indices with a field whose value lies within a given range.
OpenSearch Java SDK provides RangeQuery builder that we can use.
RangeQuery rangeQuery = new RangeQuery.Builder().field("age").from(JsonData.of("15")).to(JsonData.of("22")).build();
SearchResponse searchResponse = openSearchClient.search(s -> {
s.index("index-name");
s.query(rangeQuery._toQuery());
return s;
}, Index.class);
for (int i = 0; i < searchResponse.hits().hits().size(); i++) {
System.out.println(searchResponse.hits().hits().get(i).source());
}
The above Range Query will search for age between 15 and 22.
We can also query between multiple fields in the specified range. The below query will search for age greater than and equal to 20 and salary less than and equal to 34000
RangeQuery rangeQuery = new RangeQuery.Builder().field("age").gte(JsonData.of("20")).field("salary").lte(JsonData.of("34000")).build();
SearchResponse searchResponse = openSearchClient.search(s -> {
s.index("index-name");
s.query(rangeQuery._toQuery());
return s;
}, Index.class);
for (int i = 0; i < searchResponse.hits().hits().size(); i++) {
System.out.println(searchResponse.hits().hits().get(i).source());
}
The available options for range query is
- from
- to
- gte: greater than equal to
- gt: greater than
- lte: less than equal to
- lt: less than