Elasticsearch scripting engine

prasperl · August 25, 2017, 11:11pm

I am using elasticsearch 5.5 and I am trying to implement my own scoring algorithm to calculate the edit distance and come up with a custom score.

I found lot of good examples of native scripts to do this,but since native since are deperecated in 5.5 I need to do this in scrpting engine.Does anyone have good examples of such custom score implementation via scripting engine?

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-engine.html

Native script example:

github.com

thomasheckmann/elasticsearch-hamming/blob/master/elasticsearch-hamming/src/main/java/dk/kolbeck/elastic/plugin/hamming/HammingDistanceScriptFactory.java

package dk.kolbeck.elastic.plugin.hamming;

import java.util.Map;

import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.xcontent.support.XContentMapValues;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.script.AbstractFloatSearchScript;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.NativeScriptFactory;
import org.elasticsearch.script.ScriptException;

/**
 * Factory for the script that calculates the Hamming distance between 'hash'
 * and field
 * <p/>
 * This native script demonstrates how to write native custom scores scripts.
 */
public class HammingDistanceScriptFactory implements NativeScriptFactory {

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rjernst · August 26, 2017, 4:09pm

The scripting documentation that you link is the defacto example. It shows all the boiler plate necessary for a ScriptEngine, as well as the details of accessing eg Lucene internals (PostingsEnum in this case). What additionally are you looking for?

prasperl · August 26, 2017, 4:39pm

Thanks @rjernst..Where could I find more information about all the methods and function?For example,leafscorefunction.I think what I am trying to find is something like a developer guide

rjernst · August 26, 2017, 4:58pm

You'll need to look at the javadocs and sourcecode, both for Elasticsearch and Lucene. Unfortunately there is no developer guide (yet). It is something that I personally would like to see as well, but our plugin api is still very much in flux, and until it is stabilized, working on such a guide would result in a lot of churn.

system · September 23, 2017, 4:58pm

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