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Book Overview & Buying
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Table Of Contents
ElasticSearch Cookbook - Second Edition
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ElasticSearch does not only support simple documents, but it also lets you define a hierarchy based on parent and children. The has_child query allows you to query for the parent documents of which children match some queries.
You need a working ElasticSearch cluster and an index populated with the script chapter_05/populate_query.sh, available in the code bundle for this book.
In order to execute the has_child queries/filters, perform the following steps:
Search for the parents, test-type, for which the children, test-type2, have a term in the field value as value1. We can create this kind of query as follows:
curl -XPOST 'http://127.0.0.1:9200/test-index/test-type/_search?pretty=true' -d '{ "query": { "has_child" : { "type" : "test-type2", "query" : { "term" : { "value" : "value1" } } } } }'
If scoring is not important for performances, it's better to reformulate the query as...
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