This plugin extends Elasticsearch with a term list capability. It presents a list of terms in a field of an index and can also list each terms frequency. Term lists can be generated from one index or even of all of the indexes.
| Elasticsearch | Plugin | Release date |
|---|---|---|
| 2.3.0 | 2.3.0.0 | March 29, 2016 |
| 2.2.0 | 2.2.0.2 | March 22, 2016 |
| 1.5.2 | 1.5.2.0 | Jun 5, 2015 |
| 1.5.0 | 1.5.0.0 | Apr 9, 2015 |
| 1.4.4 | 1.4.4.0 | Mar 15, 2015 |
| 1.4.0 | 1.4.0.2 | Feb 19, 2015 |
| 1.4.0 | 1.4.0.1 | Jan 14, 2015 |
| 1.4.0 | 1.4.0.0 | Nov 18, 2014 |
| 1.3.2 | 1.3.0.0 | Aug 21, 2014 |
| 1.2.1 | 1.2.1.0 | Jul 3, 2014 |
./bin/plugin -install index-termlist -url http://xbib.org/repository/org/xbib/elasticsearch/plugin/elasticsearch-index-termlist/1.5.2.0/elasticsearch-index-termlist-1.5.2.0-plugin.zip
Do not forget to restart the node after installing.
The Maven project site is available at Github
All feedback is welcome! If you find issues, please post them at Github
Getting the list of all terms indexed is useful for various purposes, for example
- term statistics
- 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.
For each term, statistics are computed.
{
"_shards": {
"total": 3,
"successful": 3,
"failed": 0
},
"took": 384,
"numdocs": 51279,
"numterms": 100,
"terms": [
{
"term": "aacr2",
"totalfreq": 34699,
"docfreq": 34697,
"min": 1,
"max": 2,
"mean": 1.0000505458956723,
"geomean": 1.0000399550985877,
"sumofsquares": 34703,
"sumoflogs": 1.3862943611198906,
"sigma": 0.008475454987021664,
"variance": 0.00007183333723703039
}, ...
took - milliseconds required for executing
numdocs - the number of documents examined
numterms - the number of terms returned
terms - the array of term infos
term - the name of the term
totalfreq - the total number of occurrences of this term
docfreq - the document count where this term appears in
min - the minimum number of occurrences of this term in a document
max - the maximum number of occurrences of this term in a document
mean - the mean of the term occurences
geomean - the gemotric mean of the term occurrences
sumofsquares - sum of the squares of the term occurrences
sumoflogs - sum of the logarithms of the term occurences
variance - the variance of the term occurences
sigma - the standard deviation, equal to sqrt(variance)
Consider the following example
curl -XDELETE 'http://localhost:9200/test/'
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'
Get term list of index test of field message
curl -XGET 'http://localhost:9200/test/_termlist?field=message'
Get term list of index test with total frequencies but only the first three of the list
curl -XGET 'http://localhost:9200/test/_termlist?size=3'
Get term list of terms starting with hello in index test field test
curl -XGET 'http://localhost:9200/test/_termlist?field=test&term=hello'
A page of 100 terms of a sorted list of terms in your index beginning with a
curl -XGET 'http://localhost:9200/books/_termlist?term=a&sortbyterms&pretty&from=0&size=100'
A page of 100 terms of a sorted list of terms in your index beginning with frodo,'frod','fro' and 'fr', since your backtracingcount is set to 3
curl -XGET 'http://localhost:9200/books/_termlist?term=frodo&sortbyterms&pretty&from=0&size=100*backtracingcount=3'
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) 2011-2015 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.
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