Raudikko Analysis for Elasticsearch

The Raudikko Analysis plugin provides Finnish language analysis using Raudikko.

Supported versions

Plugin version	Raudikko version	Elasticsearch versions
0.1.2	0.1.2	8.x.x
0.1.1	0.1.1	7.x.x
0.1	0.1.1	7.3.2, 7.10.0

The plugin should support all 8.x.x versions, but Elasticsearch requires the plugin to declare an exact ES version, so each release of the plugin has several packages per ES version. Check releases if the version you need is included, and if not, please create an issue requesting support for that version.

Looking for a version for OpenSearch? Check out opensearch-analysis-raudikko.

Installing

To install the plugin, run the following command, changing the version in URL to match your version of Elasticsearch:

bin/elasticsearch-plugin install https://github.com/EvidentSolutions/elasticsearch-analysis-raudikko/releases/download/v0.1.1/elasticsearch-analysis-raudikko-0.1.1-es7.16.3.zip

Docker

Building the plugin and running with docker

./gradlew build -DelasticsearchVersion=8.5.3
cd etc
docker compose build --build-arg "ES_VERSION=8.5.3"
docker compose up

Elasticsearch should be running and available at port 9200

Verify installation

After installing the plugin, you can quickly verify that it works by executing:

curl -XGET 'localhost:9200/_analyze' -H 'Content-Type: application/json' -d '
{
  "tokenizer" : "finnish",
  "filter" : [{"type": "raudikko"}],
  "text" : "Testataan raudikon analyysiä tällä tavalla yksinkertaisesti."
}'

If this works without error messages, you can proceed to configure the plugin index.

Configuring

Include finnish tokenizer and raudikko filter in your analyzer, for example:

{
  "index": {
    "analysis": {
      "analyzer": {
        "default": {
          "tokenizer": "finnish",
          "filter": ["lowercase", "raudikkoFilter"]
        }
      },
      "filter": {
        "raudikkoFilter": {
          "type": "raudikko"
        }
      }
    }
  }
}

You can use the following filter options to customize the behaviour of the filter:

Parameter	Default value	Description
analyzeAll	true	Use all analysis possibilities or just the first
splitCompoundWords	false	Split analysed compound words to its parts
minimumWordSize	3	minimum length of words to analyze
maximumWordSize	100	maximum length of words to analyze
analysisCacheSize	1024	number of analysis results to cache

Compatibility with elasticsearch-analysis-voikko

This plugin supersedes elasticsearch-analysis-voikko and is fully compatible with it (it provides a filter named voikko as a compatibility measure). Therefore, you can remove the old plugin from your Elasticsearch installation and replace it with this plugin without having to reindex anything. Just make sure to uninstall the old plugin bin/elasticsearch-plugin remove elasticsearch-analysis-voikko when installing this one in place.

License and copyright

Copyright (C) 2021-2022 Evident Solutions Oy

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.