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Python lang Plugin for Elasticsearch

The Python (jython) language plugin allows to have python as the language of scripts to execute.

In order to install the plugin, simply run:

bin/plugin install elasticsearch/elasticsearch-lang-python/2.5.0

You need to install a version matching your Elasticsearch version:

elasticsearch	Python Lang Plugin	Docs
master	Build from source	See below
es-1.x	Build from source	2.6.0-SNAPSHOT
es-1.5	2.5.0	2.5.0
es-1.4	2.4.1	2.4.1
es-1.3	2.3.1	2.3.1
< 1.3.5	2.3.0	2.3.0
es-1.2	2.2.0	2.2.0
es-1.0	2.0.0	2.0.0
es-0.90	1.0.0	1.0.0

To build a SNAPSHOT version, you need to build it with Maven:

mvn clean install
plugin install lang-python \
       --url file:target/releases/elasticsearch-lang-python-X.X.X-SNAPSHOT.zip

User Guide

Using python with function_score

Let's say you want to use function_score API using python. Here is a way of doing it:

curl -XDELETE "http://localhost:9200/test"

curl -XPUT "http://localhost:9200/test/doc/1" -d '{
  "num": 1.0
}'

curl -XPUT "http://localhost:9200/test/doc/2?refresh" -d '{
  "num": 2.0
}'

curl -XGET "http://localhost:9200/test/_search?pretty" -d'
{
  "query": {
    "function_score": {
      "script_score": {
        "script": "doc[\"num\"].value * _score",
        "lang": "python"
      }
    }
  }
}'

gives

{
   // ...
   "hits": {
      "total": 2,
      "max_score": 2,
      "hits": [
         {
            // ...
            "_score": 2
         },
         {
            // ...
            "_score": 1
         }
      ]
   }
}

Using python with script_fields

curl -XDELETE "http://localhost:9200/test"

curl -XPUT "http://localhost:9200/test/doc/1?refresh" -d'
{
  "obj1": {
   "test": "something"
  },
  "obj2": {
    "arr2": [ "arr_value1", "arr_value2" ]
  }
}'

curl -XGET "http://localhost:9200/test/_search" -d'
{
  "script_fields": {
    "s_obj1": {
      "script": "_source[\"obj1\"]", "lang": "python"
    },
    "s_obj1_test": {
      "script": "_source[\"obj1\"][\"test\"]", "lang": "python"
    },
    "s_obj2": {
      "script": "_source[\"obj2\"]", "lang": "python"
    },
    "s_obj2_arr2": {
      "script": "_source[\"obj2\"][\"arr2\"]", "lang": "python"
    }
  }
}'