Allow custom queries in painless scripting language #1748
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This allows the user to write a custom query in the painless scripting language https://www.elastic.co/guide/en/elasticsearch/painless/current/index.html.
For example, to search for a post by meta.birthday for all people born in March, you can use the following code:
$args['custom_query'][] = "doc['meta.birthday'].value.getMonthValue() == 3";