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<h2 class="title"><a id="analysis-fingerprint-analyzer"></a>Fingerprint Analyzer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.3/docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc">edit</a></h2>
</div></div></div>
<p>The <code class="literal">fingerprint</code> analyzer implements a
<a href="https://github.com/OpenRefine/OpenRefine/wiki/Clustering-In-Depth#fingerprint" class="ulink" target="_top">fingerprinting algorithm</a>
which is used by the OpenRefine project to assist in clustering.</p>
<p>Input text is lowercased, normalized to remove extended characters, sorted,
deduplicated and concatenated into a single token. If a stopword list is
configured, stop words will also be removed.</p>
<h3><a id="_example_output_7"></a>Example output<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.3/docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc">edit</a></h3>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST _analyze
{
"analyzer": "fingerprint",
"text": "Yes yes, Gödel said this sentence is consistent and."
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/705.console"></div>
<p>The above sentence would produce the following single term:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ and consistent godel is said sentence this yes ]</pre>
</div>
<h3><a id="_configuration_7"></a>Configuration<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.3/docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc">edit</a></h3>
<p>The <code class="literal">fingerprint</code> analyzer accepts the following parameters:</p>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">separator</code>
</p>
</td>
<td valign="top">
<p>
The character to use to concatenate the terms. Defaults to a space.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">max_output_size</code>
</p>
</td>
<td valign="top">
<p>
The maximum token size to emit. Defaults to <code class="literal">255</code>. Tokens larger than
this size will be discarded.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">stopwords</code>
</p>
</td>
<td valign="top">
<p>
A pre-defined stop words list like <code class="literal">_english_</code> or an array containing a
list of stop words. Defaults to <code class="literal">_none_</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">stopwords_path</code>
</p>
</td>
<td valign="top">
<p>
The path to a file containing stop words.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p>See the <a class="xref" href="analysis-stop-tokenfilter.html" title="Stop Token Filter">Stop Token Filter</a> for more information
about stop word configuration.</p>
<h3><a id="_example_configuration_4"></a>Example configuration<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.3/docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc">edit</a></h3>
<p>In this example, we configure the <code class="literal">fingerprint</code> analyzer to use the
pre-defined list of English stop words:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT my_index
{
"settings": {
"analysis": {
"analyzer": {
"my_fingerprint_analyzer": {
"type": "fingerprint",
"stopwords": "_english_"
}
}
}
}
}
POST my_index/_analyze
{
"analyzer": "my_fingerprint_analyzer",
"text": "Yes yes, Gödel said this sentence is consistent and."
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/706.console"></div>
<p>The above example produces the following term:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ consistent godel said sentence yes ]</pre>
</div>
<h3><a id="_definition_7"></a>Definition<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.3/docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc">edit</a></h3>
<p>The <code class="literal">fingerprint</code> tokenizer consists of:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
Tokenizer
</span>
</dt>
<dd>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="analysis-standard-tokenizer.html" title="Standard Tokenizer">Standard Tokenizer</a>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">
Token Filters (in order)
</span>
</dt>
<dd>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="analysis-lowercase-tokenfilter.html" title="Lowercase Token Filter">Lower Case Token Filter</a>
</li>
<li class="listitem">
<a class="xref" href="analysis-asciifolding-tokenfilter.html" title="ASCII Folding Token Filter">ASCII Folding Token Filter</a>
</li>
<li class="listitem">
<a class="xref" href="analysis-stop-tokenfilter.html" title="Stop Token Filter">Stop Token Filter</a> (disabled by default)
</li>
<li class="listitem">
<a class="xref" href="analysis-fingerprint-tokenfilter.html" title="Fingerprint Token Filter">Fingerprint Token Filter</a>
</li>
</ul>
</div>
</dd>
</dl>
</div>
<p>If you need to customize the <code class="literal">fingerprint</code> analyzer beyond the configuration
parameters then you need to recreate it as a <code class="literal">custom</code> analyzer and modify
it, usually by adding token filters. This would recreate the built-in
<code class="literal">fingerprint</code> analyzer and you can use it as a starting point for further
customization:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT /fingerprint_example
{
"settings": {
"analysis": {
"analyzer": {
"rebuilt_fingerprint": {
"tokenizer": "standard",
"filter": [
"lowercase",
"asciifolding",
"fingerprint"
]
}
}
}
}
}</pre>
</div>
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