176 lines
7.3 KiB
Markdown
176 lines
7.3 KiB
Markdown
ICU Analysis for ElasticSearch
|
|
==================================
|
|
|
|
The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.
|
|
|
|
In order to install the plugin, simply run: `bin/plugin -install elasticsearch/elasticsearch-analysis-icu/1.10.0`.
|
|
|
|
-----------------------------------------------
|
|
| ICU Analysis Plugin | ElasticSearch |
|
|
-----------------------------------------------
|
|
| 1.11.0-SNAPSHOT (master) | 0.90.1 -> master |
|
|
-----------------------------------------------
|
|
| 1.10.0 | 0.90.1 -> master |
|
|
-----------------------------------------------
|
|
| 1.9.0 | 0.90.0 |
|
|
-----------------------------------------------
|
|
| 1.8.0 | 0.90.0 |
|
|
-----------------------------------------------
|
|
| 1.7.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.6.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.5.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.4.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.3.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.2.0 | 0.19 -> 0.20 |
|
|
-----------------------------------------------
|
|
| 1.1.0 | 0.18 |
|
|
-----------------------------------------------
|
|
| 1.0.0 | 0.18 |
|
|
-----------------------------------------------
|
|
|
|
|
|
ICU Normalization
|
|
-----------------
|
|
|
|
Normalizes characters as explained "here":http://userguide.icu-project.org/transforms/normalization. It registers itself by default under `icu_normalizer` or `icuNormalizer` using the default settings. Allows for the name parameter to be provided which can include the following values: `nfc`, `nfkc`, and `nfkc_cf`. Here is a sample settings:
|
|
|
|
{
|
|
"index" : {
|
|
"analysis" : {
|
|
"analyzer" : {
|
|
"collation" : {
|
|
"tokenizer" : "keyword",
|
|
"filter" : ["icu_normalizer"]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ICU Folding
|
|
-----------
|
|
|
|
Folding of unicode characters based on `UTR#30`. It registers itself under `icu_folding` and `icuFolding` names. Sample setting:
|
|
|
|
{
|
|
"index" : {
|
|
"analysis" : {
|
|
"analyzer" : {
|
|
"collation" : {
|
|
"tokenizer" : "keyword",
|
|
"filter" : ["icu_folding"]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ICU Collation
|
|
-------------
|
|
|
|
Uses collation token filter. Allows to either specify the rules for collation (defined "here":http://www.icu-project.org/userguide/Collate_Customization.html) using the `rules` parameter (can point to a location or expressed in the settings, location can be relative to config location), or using the `language` parameter (further specialized by country and variant). By default registers under `icu_collation` or `icuCollation` and uses the default locale.
|
|
|
|
Here is a sample settings:
|
|
|
|
{
|
|
"index" : {
|
|
"analysis" : {
|
|
"analyzer" : {
|
|
"collation" : {
|
|
"tokenizer" : "keyword",
|
|
"filter" : ["icu_collation"]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
And here is a sample of custom collation:
|
|
|
|
{
|
|
"index" : {
|
|
"analysis" : {
|
|
"analyzer" : {
|
|
"collation" : {
|
|
"tokenizer" : "keyword",
|
|
"filter" : ["myCollator"]
|
|
}
|
|
},
|
|
"filter" : {
|
|
"myCollator" : {
|
|
"type" : "icu_collation",
|
|
"language" : "en"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Optional options:
|
|
* `strength` - The strength property determines the minimum level of difference considered significant during comparison.
|
|
The default strength for the Collator is `tertiary`, unless specified otherwise by the locale used to create the Collator.
|
|
Possible values: `primary`, `secondary`, `tertiary`, `quaternary` or `identical`.
|
|
See ICU Collation:http://icu-project.org/apiref/icu4j/com/ibm/icu/text/Collator.html documentation for a more detailed
|
|
explanation for the specific values.
|
|
* `decomposition` - Possible values: `no` or `canonical`. Defaults to `no`. Setting this decomposition property with
|
|
`canonical` allows the Collator to handle un-normalized text properly, producing the same results as if the text were
|
|
normalized. If `no` is set, it is the user's responsibility to insure that all text is already in the appropriate form
|
|
before a comparison or before getting a CollationKey. Adjusting decomposition mode allows the user to select between
|
|
faster and more complete collation behavior. Since a great many of the world's languages do not require text
|
|
normalization, most locales set `no` as the default decomposition mode.
|
|
|
|
Expert options:
|
|
* `alternate` - Possible values: `shifted` or `non-ignorable`. Sets the alternate handling for strength `quaternary`
|
|
to be either shifted or non-ignorable. What boils down to ignoring punctuation and whitespace.
|
|
* `caseLevel` - Possible values: `true` or `false`. Default is `false`. Whether case level sorting is required. When
|
|
strength is set to `primary` this will ignore accent differences.
|
|
* `caseFirst` - Possible values: `lower` or `upper`. Useful to control which case is sorted first when case is not ignored
|
|
for strength `tertiary`.
|
|
* `numeric` - Possible values: `true` or `false`. Whether digits are sorted according to numeric representation. For
|
|
example the value `egg-9` is sorted before the value `egg-21`. Defaults to `false`.
|
|
* `variableTop` - Single character or contraction. Controls what is variable for `alternate`.
|
|
* `hiraganaQuaternaryMode` - Possible values: `true` or `false`. Defaults to `false`. Distinguishing between Katakana
|
|
and Hiragana characters in `quaternary` strength .
|
|
|
|
ICU Tokenizer
|
|
-------------
|
|
|
|
Breaks text into words according to UAX #29: Unicode Text Segmentation ((http://www.unicode.org/reports/tr29/)).
|
|
|
|
{
|
|
"index" : {
|
|
"analysis" : {
|
|
"analyzer" : {
|
|
"collation" : {
|
|
"tokenizer" : "icu_tokenizer",
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
License
|
|
-------
|
|
|
|
This software is licensed under the Apache 2 license, quoted below.
|
|
|
|
Copyright 2009-2013 Shay Banon and ElasticSearch <http://www.elasticsearch.org>
|
|
|
|
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.
|