Elasticsearch should operation query - elasticsearch

How can I imply a "should" operation for
("tag"="A" OR "tag"="B") and "name"="cat"
like ?
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery()
.should(QueryBuilders.matchQuery("tag","A"))
.shold(QueryBuilders.matchQuery("tag","B"))
.must(QueryBuilders.matchQuery("name","cat"));


If you want to do ("tag"="A" OR "tag"="B") and "name"="cat", you can do as follow :
BoolQueryBuilder aOrB = QueryBuilders.boolQuery()
.should(QueryBuilders.matchQuery("tag","A"))
.should(QueryBuilders.matchQuery("tag","B"))
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery()
.must(aOrB);
.must(QueryBuilders.matchQuery("name","cat"));

Related

Add Size in Elastic NativeSearchQuery

final QueryBuilder contentTagQuery = QueryBuilders.boolQuery()
.filter( QueryBuilders.termQuery("tenantId" , "en"));
SearchHits<Content> searchHits =
elasticsearchOperations.search(
new NativeSearchQuery(contentTagQuery), Content.class,
IndexCoordinates.of("index"));
How can I add size in this query, as I only need the first result.

You can set this on the Query instance:
NativeSearchQuery query = new NativeSearchQuery(contentTagQuery);
query.setMaxResults(1);

matchAllQuery() in ElasticSearch

matchAllQuery() in Elasticsearch gets me only 10 results how do I increase its output so that I can get as many results as per my requirement.
Code
QueryBuilder query = QueryBuilders.matchAllQuery();

By default 10 results are returned, you need to increase the size parameter:
SearchRequestBuilder request = client.prepareSearch(index)
.setQuery(QueryBuilders.matchAllQuery())
.setSize(100);

Yes u can do , here you can pass aPageRequestcount whatever you want and If you want no of records exist in Elastic search than repository.count() will work for that :-
int aPageRequestcount = (int) repository.count();
NativeSearchQueryBuilder aNativeSearchQueryBuilder = new NativeSearchQueryBuilder();
aNativeSearchQueryBuilder.withIndices(indexName).withTypes(type).withPageable(new PageRequest(0, aPageRequestcount));
final BoolQueryBuilder aQuery = new BoolQueryBuilder();
NativeSearchQuery nativeSearchQuery = aNativeSearchQueryBuilder.withQuery(aQuery).build();
= elasticsearchTemplate.queryForList(nativeSearchQuery, A.class);

How to create a search with or clause using Elasticsearch

I want to create a query with Elasticsearch Java API but I don't know how to create an OR clause? What I want to query is;
SELECT *
FROM USERS
WHERE (user.name = "admin") AND (user.message LIKE "test*") AND (user.age = "30" OR user.status = "major")
I have created a query like below but I don't know how to create an OR clause like sql query;
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.matchQuery("name", "admin"));
boolQueryBuilder.must(QueryBuilders.matchQuery("message", "test*"));
boolQueryBuilder.must(QueryBuilders.matchQuery("age", "30"));
boolQueryBuilder.must(QueryBuilders.matchQuery("status","major"));

You simply need to capture the OR condition inside another bool/should query
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.matchQuery("name", "admin"));
boolQueryBuilder.mustNot(QueryBuilders.matchQuery("message", "test*"));
BoolQueryBuilder orQuery = QueryBuilders.boolQuery();
orQuery.should(QueryBuilders.matchQuery("age", "30"));
orQuery.should(QueryBuilders.matchQuery("status","major"));
orQuery.minimumNumberShouldMatch(1);
boolQueryBuilder.must(orQuery);
PS: not sure why you have a mustNot for your second constraint.

The "should" keyword in bool queries works like "OR", but in Elasticsearch those queries are not very sharp as everything is scored.
Have a look at:
https://www.elastic.co/guide/en/elasticsearch/guide/current/bool-query.html#bool-query
Also there are very good examples in the book Elasticsearch in Action.

QueryFilterBuilder elastic search 2.4

I hav ethis piece of code now as of elastic search 2.4 QueryFilterBuilder is deprecated and its showing error.
QueryFilterBuilder queryFilterBuilder = FilterBuilders.queryFilter(esQueryBuilder); i tried to replace it with QueryBuider but its not accepting.
if (StringUtils.isNotBlank(textQuery)) {
QueryBuilder esQueryBuilder = CatalogKeywordSearchHelper.getAppropriateESQueryForUserQuery(storeId, textQuery);
QueryFilterBuilder queryFilterBuilder = FilterBuilders.queryFilter(esQueryBuilder);
filterBuildersMap.put(IdxSchemaConstants.TEXT_QUERY, queryFilterBuilder);
}

Query filters have been deprecated in ES 2.0 and since then queries can now be used in a filter context, you can simply use a bool/filter query and put your query in it:
if (StringUtils.isNotBlank(textQuery)) {
QueryBuilder esQueryBuilder = CatalogKeywordSearchHelper.getAppropriateESQueryForUserQuery(storeId, textQuery);
# change this line
BoolQueryBuilder queryFilterBuilder = QueryBuilders.boolQuery()
.filter(esQueryBuilder);
filterBuildersMap.put(IdxSchemaConstants.TEXT_QUERY, queryFilterBuilder);
}

Elasticsearch should not operation query

Say we can match ("name"="A" AND "name!="B") as,
BoolQueryBuilder queryBuilder1 = QueryBuilders.boolQuery()
.must(QueryBuilders.matchQuery("name","A"))
.mustNot(QueryBuilders.matchQuery("name","B"));
How can I imply a "shouldNot" operation for ("name"="A" OR "name"!="B")
like,
BoolQueryBuilder queryBuilder1 = QueryBuilders.boolQuery()
.should(QueryBuilders.matchQuery("name","A"))
.sholdNot(QueryBuilders.matchQuery("name","B")); // This API not exists..!

You can use this:
BoolQueryBuilder queryBuilder1 = QueryBuilders.boolQuery()
.should(QueryBuilders.matchQuery("name","A"))
.should(QueryBuilders.boolQuery()
.mustNot(QueryBuilders.matchQuery("name","B")))

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