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<div class="titlepage"><div><div>
<h2 class="title"><a id="analysis-icu-plugin"></a>ICU Analysis Plugin<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h2>
</div></div></div>
<p>The <a href="http://icu-project.org/" class="ulink" target="_top">ICU</a> analysis plugin allows for unicode
normalization, collation and folding. The plugin is called
<a href="https://github.com/elasticsearch/elasticsearch-analysis-icu" class="ulink" target="_top">elasticsearch-analysis-icu</a>.</p>
<p>The plugin includes the following analysis components:</p>
<h3><a id="icu-normalization"></a>ICU Normalization<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h3>
<p>Normalizes characters as explained
<a href="http://userguide.icu-project.org/transforms/normalization" class="ulink" target="_top">here</a>. It
registers itself by default under <code class="literal">icu_normalizer</code> or <code class="literal">icuNormalizer</code>
using the default settings. Allows for the name parameter to be provided
which can include the following values: <code class="literal">nfc</code>, <code class="literal">nfkc</code>, and <code class="literal">nfkc_cf</code>.
Here is a sample settings:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"normalization" : {
"tokenizer" : "keyword",
"filter" : ["icu_normalizer"]
}
}
}
}
}</pre>
</div>
<h3><a id="icu-folding"></a>ICU Folding<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h3>
<p>Folding of unicode characters based on <code class="literal">UTR#30</code>. It registers itself
under <code class="literal">icu_folding</code> and <code class="literal">icuFolding</code> names.
The filter also does lowercasing, which means the lowercase filter can
normally be left out. Sample setting:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"folding" : {
"tokenizer" : "keyword",
"filter" : ["icu_folding"]
}
}
}
}
}</pre>
</div>
<h4><a id="icu-filtering"></a>Filtering<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h4>
<p>The folding can be filtered by a set of unicode characters with the
parameter <code class="literal">unicodeSetFilter</code>. This is useful for a non-internationalized
search engine where retaining a set of national characters which are
primary letters in a specific language is wanted. See syntax for the
UnicodeSet
<a href="http://icu-project.org/apiref/icu4j/com/ibm/icu/text/UnicodeSet.html" class="ulink" target="_top">here</a>.</p>
<p>The Following example exempts Swedish characters from the folding. Note
that the filtered characters are NOT lowercased which is why we add that
filter below.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"folding" : {
"tokenizer" : "standard",
"filter" : ["my_icu_folding", "lowercase"]
}
}
"filter" : {
"my_icu_folding" : {
"type" : "icu_folding"
"unicodeSetFilter" : "[^åäöÅÄÖ]"
}
}
}
}
}</pre>
</div>
<h3><a id="icu-collation"></a>ICU Collation<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h3>
<p>Uses collation token filter. Allows to either specify the rules for
collation (defined
<a href="http://www.icu-project.org/userguide/Collate_Customization.html" class="ulink" target="_top">here</a>)
using the <code class="literal">rules</code> parameter (can point to a location or expressed in the
settings, location can be relative to config location), or using the
<code class="literal">language</code> parameter (further specialized by country and variant). By
default registers under <code class="literal">icu_collation</code> or <code class="literal">icuCollation</code> and uses the
default locale.</p>
<p>Here is a sample settings:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"collation" : {
"tokenizer" : "keyword",
"filter" : ["icu_collation"]
}
}
}
}
}</pre>
</div>
<p>And here is a sample of custom collation:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"collation" : {
"tokenizer" : "keyword",
"filter" : ["myCollator"]
}
},
"filter" : {
"myCollator" : {
"type" : "icu_collation",
"language" : "en"
}
}
}
}
}</pre>
</div>
<h4><a id="_options_7"></a>Options<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h4>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">strength</code>
</p>
</td>
<td valign="top">
<p>
<p>
The strength property determines the minimum level of difference considered significant during comparison.
</p>
<p>The default strength for the Collator is <code class="literal">tertiary</code>, unless specified otherwise by the locale used to create the Collator.
Possible values: <code class="literal">primary</code>, <code class="literal">secondary</code>, <code class="literal">tertiary</code>, <code class="literal">quaternary</code> or <code class="literal">identical</code>.</p>
<p>See <a href="http://icu-project.org/apiref/icu4j/com/ibm/icu/text/Collator.html" class="ulink" target="_top">ICU Collation</a> documentation for a more detailed
explanation for the specific values.</p>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">decomposition</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">no</code> or <code class="literal">canonical</code>. Defaults to <code class="literal">no</code>. Setting this decomposition property with
<code class="literal">canonical</code> allows the Collator to handle un-normalized text properly, producing the same results as if the text were
normalized. If <code class="literal">no</code> 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 <code class="literal">no</code> as the default decomposition mode.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<h4><a id="_expert_options"></a>Expert options:<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h4>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">alternate</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">shifted</code> or <code class="literal">non-ignorable</code>. Sets the alternate handling for strength <code class="literal">quaternary</code>
to be either shifted or non-ignorable. What boils down to ignoring punctuation and whitespace.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">caseLevel</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">true</code> or <code class="literal">false</code>. Default is <code class="literal">false</code>. Whether case level sorting is required. When
strength is set to <code class="literal">primary</code> this will ignore accent differences.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">caseFirst</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">lower</code> or <code class="literal">upper</code>. Useful to control which case is sorted first when case is not ignored
for strength <code class="literal">tertiary</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">numeric</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">true</code> or <code class="literal">false</code>. Whether digits are sorted according to numeric representation. For
example the value <code class="literal">egg-9</code> is sorted before the value <code class="literal">egg-21</code>. Defaults to <code class="literal">false</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">variableTop</code>
</p>
</td>
<td valign="top">
<p>
Single character or contraction. Controls what is variable for <code class="literal">alternate</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">hiraganaQuaternaryMode</code>
</p>
</td>
<td valign="top">
<p>
Possible values: <code class="literal">true</code> or <code class="literal">false</code>. Defaults to <code class="literal">false</code>. Distinguishing between Katakana and
Hiragana characters in <code class="literal">quaternary</code> strength .
</p>
</td>
</tr>
</tbody>
</table>
</div>
<h3><a id="_icu_tokenizer"></a>ICU Tokenizer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h3>
<p>Breaks text into words according to UAX #29: Unicode Text Segmentation <a href="http://www.unicode.org/reports/tr29/" class="ulink" target="_top">http://www.unicode.org/reports/tr29/</a>.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"collation" : {
"tokenizer" : "icu_tokenizer",
}
}
}
}
}</pre>
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<h3><a id="_icu_normalization_charfilter"></a>ICU Normalization CharFilter<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/icu-plugin.asciidoc">edit</a></h3>
<p>Normalizes characters as explained <a href="http://userguide.icu-project.org/transforms/normalization" class="ulink" target="_top">here</a>.
It registers itself by default under <code class="literal">icu_normalizer</code> or <code class="literal">icuNormalizer</code> using the default settings.
Allows for the name parameter to be provided which can include the following values: <code class="literal">nfc</code>, <code class="literal">nfkc</code>, and <code class="literal">nfkc_cf</code>.
Allows for the mode parameter to be provided which can include the following values: <code class="literal">compose</code> and <code class="literal">decompose</code>.
Use <code class="literal">decompose</code> with <code class="literal">nfc</code> or <code class="literal">nfkc</code>, to get <code class="literal">nfd</code> or <code class="literal">nfkd</code>, respectively.
Here is a sample settings:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">{
"index" : {
"analysis" : {
"analyzer" : {
"collation" : {
"tokenizer" : "keyword",
"char_filter" : ["icu_normalizer"]
}
}
}
}
}</pre>
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