Specialized queries
editSpecialized queries
editThis group contains queries which do not fit into the other groups:
-
more_like_this
query - This query finds documents which are similar to the specified text, document, or collection of documents.
-
script
query -
This query allows a script to act as a filter. Also see the
function_score
query. -
percolate
query - This query finds percolator queries based on documents.
-
wrapper
query - A query that accepts other queries as json or yaml string.
More Like This Query
editScript Query
editSee Script Query
If you have stored on each data node a script named myscript.painless
with:
doc['num1'].value > params.param1
You can use it then with:
Percolate Query
editSee: * Percolate Query
Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build(); TransportClient client = new PreBuiltTransportClient(settings); client.addTransportAddress(new TransportAddress(new InetSocketAddress(InetAddresses.forString("127.0.0.1"), 9300)));
Before the percolate
query can be used an percolator
mapping should be added and
a document containing a percolator query should be indexed:
// create an index with a percolator field with the name 'query': client.admin().indices().prepareCreate("myIndexName") .addMapping("_doc", "query", "type=percolator", "content", "type=text") .get(); //This is the query we're registering in the percolator QueryBuilder qb = termQuery("content", "amazing"); //Index the query = register it in the percolator client.prepareIndex("myIndexName", "_doc", "myDesignatedQueryName") .setSource(jsonBuilder() .startObject() .field("query", qb) // Register the query .endObject()) .setRefreshPolicy(RefreshPolicy.IMMEDIATE) // Needed when the query shall be available immediately .get();
This indexes the above term query under the name myDesignatedQueryName.
In order to check a document against the registered queries, use this code:
//Build a document to check against the percolator XContentBuilder docBuilder = XContentFactory.jsonBuilder().startObject(); docBuilder.field("content", "This is amazing!"); docBuilder.endObject(); //End of the JSON root object PercolateQueryBuilder percolateQuery = new PercolateQueryBuilder("query", "_doc", BytesReference.bytes(docBuilder)); // Percolate, by executing the percolator query in the query dsl: SearchResponse response = client().prepareSearch("myIndexName") .setQuery(percolateQuery)) .get(); //Iterate over the results for(SearchHit hit : response.getHits()) { // Percolator queries as hit }
Wrapper Query
editSee Wrapper Query