This plugin extends Elasticsearch with a term list capability, not only revealing all occuring terms but also stating each terms frequency. Term lists can be generated from indexes, or even of all of the indexes in the cluster.
Prerequisites:
Elasticsearch 0.90+
| ES version | Plugin | Release date | Command |
| 0.90.5 | 1.3.0 | Oct 16, 2013 | ./bin/plugin --install termlist --url http://bit.ly/1bzHfIl |
| 0.90.7 | 1.4.0 | Dec 20, 2013 | ./bin/plugin --install termlist --url http://bit.ly/1c70ICf |
| 1.0.0.RC1 | 1.0.0.RC1.1 | Jan 16, 2014 | ./bin/plugin --install termlist --url http://bit.ly/1dSIzoW |
Do not forget to restart the node after installing.
The Maven project site is available at Github
Binaries are available at Bintray
Getting the list of all terms indexed is useful for variuos purposes, for example
- building dictionaries
- controlling the overall effects of analyzers on the indexed terms
- automatic query building on indexed terms, e.g. for load tests
- input to linguistic analysis tools
- for other post-processing of the indexed terms outside of Elasticsearch
Optionally, the term list can be narrowed down to a field name. The field name is the Lucene field name as found in the Lucene index.
Only terms of field names not starting with underscore are listed. Terms of internal fields like _uid, _all, or _type are always skipped.
Consider the following example index:
curl -XPUT 'http://localhost:9200/test/'
curl -XPUT 'http://localhost:9200/test/test/1' -d '{ "test": "Hello World" }'
curl -XPUT 'http://localhost:9200/test/test/2' -d '{ "test": "Hello Jörg Prante" }'
curl -XPUT 'http://localhost:9200/test/test/3' -d '{ "message": "elastic search" }'
Get term list of index test:
curl -XGET 'http://localhost:9200/test/_termlist'
{"_shards":{"total":5,"successful":5,"failed":0},"terms":[{"name":"search"},{"name":"prante"},{"name":"hello"},{"name":"elastic"},{"name":"world"},{"name":"jörg"}]}
Get term list of index test of field message:
curl -XGET 'http://localhost:9200/test/_termlist?field=message'
{"_shards":{"total":5,"successful":5,"failed":0},"terms":[{"name":"elastic"},{"name":"search"}]}
Get term list of index test with total frequencies:
curl -XGET 'http://localhost:9200/test/_termlist?totalfreqs'
{"_shards":{"total":5,"successful":5,"failed":0},"terms":[{"name":"hello","totalfreq":2},{"name":"world","totalfreq":1},{"name":"search","totalfreq":1},{"name":"prante","totalfreq":1},{"name":"jörg","totalfreq":1},{"name":"elastic","totalfreq":1}]}
Get term list of index test with total frequencies but only the first three terms of the list:
curl -XGET 'http://localhost:9200/test/_termlist?totalfreqs&size=3'
{"_shards":{"total":5,"successful":5,"failed":0},"terms":[{"name":"hello","totalfreq":2},{"name":"world","totalfreq":1},{"name":"search","totalfreq":1}]}
The term list is built internally into an unsorted, compact set of strings which i s not streamed to the client. You should be aware that if you have lots of unique terms in the index, this procedure consumes a lot of heap memory and may result in out of memory situations that can render your Elasticsearch cluster unusable until it is restarted.
Elasticsearch Term List Plugin
Copyright (C) 2011 Jörg Prante
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.