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<h2 class="title"><a id="analysis-custom-analyzer"></a>Create a custom analyzer<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/elasticsearch/edit/8.10/docs/reference/analysis/analyzers/custom-analyzer.asciidoc">edit</a></h2>
</div></div></div>
<p>When the built-in analyzers do not fulfill your needs, you can create a
<code class="literal">custom</code> analyzer which uses the appropriate combination of:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
zero or more <a class="xref" href="analysis-charfilters.html" title="Character filters reference">character filters</a>
</li>
<li class="listitem">
a <a class="xref" href="analysis-tokenizers.html" title="Tokenizer reference">tokenizer</a>
</li>
<li class="listitem">
zero or more <a class="xref" href="analysis-tokenfilters.html" title="Token filter reference">token filters</a>.
</li>
</ul>
</div>
<h3><a id="_configuration"></a>Configuration<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/elasticsearch/edit/8.10/docs/reference/analysis/analyzers/custom-analyzer.asciidoc">edit</a></h3>
<p>The <code class="literal">custom</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">type</code>
</p>
</td>
<td valign="top">
<p>
Analyzer type. Accepts <a class="xref" href="analysis-analyzers.html" title="Built-in analyzer reference">built-in analyzer types</a>. For
custom analyzers, use <code class="literal">custom</code> or omit this parameter.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">tokenizer</code>
</p>
</td>
<td valign="top">
<p>
A built-in or customised <a class="xref" href="analysis-tokenizers.html" title="Tokenizer reference">tokenizer</a>.
(Required)
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">char_filter</code>
</p>
</td>
<td valign="top">
<p>
An optional array of built-in or customised
<a class="xref" href="analysis-charfilters.html" title="Character filters reference">character filters</a>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">filter</code>
</p>
</td>
<td valign="top">
<p>
An optional array of built-in or customised
<a class="xref" href="analysis-tokenfilters.html" title="Token filter reference">token filters</a>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">position_increment_gap</code>
</p>
</td>
<td valign="top">
<p>
When indexing an array of text values, Elasticsearch inserts a fake "gap"
between the last term of one value and the first term of the next value to
ensure that a phrase query doesn’t match two terms from different array
elements. Defaults to <code class="literal">100</code>. See <a class="xref" href="position-increment-gap.html" title="position_increment_gap"><code class="literal">position_increment_gap</code></a> for more.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<h3><a id="_example_configuration"></a>Example configuration<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/elasticsearch/edit/8.10/docs/reference/analysis/analyzers/custom-analyzer.asciidoc">edit</a></h3>
<p>Here is an example that combines the following:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
Character Filter
</span>
</dt>
<dd>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="analysis-htmlstrip-charfilter.html" title="HTML strip character filter">HTML Strip Character Filter</a>
</li>
</ul>
</div>
</dd>
<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
</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">Lowercase 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>
</ul>
</div>
</dd>
</dl>
</div>
<div class="pre_wrapper lang-ruby alternative">
<pre class="programlisting prettyprint lang-ruby alternative">response = client.indices.create(
index: 'my-index-000001',
body: {
settings: {
analysis: {
analyzer: {
my_custom_analyzer: {
type: 'custom',
tokenizer: 'standard',
char_filter: [
'html_strip'
],
filter: [
'lowercase',
'asciifolding'
]
}
}
}
}
}
)
puts response
response = client.indices.analyze(
index: 'my-index-000001',
body: {
analyzer: 'my_custom_analyzer',
text: 'Is this déjà vu</b>?'
}
)
puts response</pre>
</div>
<a id="03582fc93683e573062bcfda45e01d69"></a>
<div class="pre_wrapper lang-console default has-ruby">
<pre class="programlisting prettyprint lang-console default has-ruby">PUT my-index-000001
{
"settings": {
"analysis": {
"analyzer": {
"my_custom_analyzer": {
"type": "custom", <a id="CO130-1"></a><i class="conum" data-value="1"></i>
"tokenizer": "standard",
"char_filter": [
"html_strip"
],
"filter": [
"lowercase",
"asciifolding"
]
}
}
}
}
}
POST my-index-000001/_analyze
{
"analyzer": "my_custom_analyzer",
"text": "Is this <b>déjà vu</b>?"
}</pre>
</div>
<div class="console_widget has-ruby" data-snippet="snippets/380.console"></div>
<div class="calloutlist default has-ruby lang-console">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO130-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>For <code class="literal">custom</code> analyzers, use a <code class="literal">type</code> of <code class="literal">custom</code> or omit the <code class="literal">type</code>
parameter.</p>
</td>
</tr>
</table>
</div>
<p>The above example produces the following terms:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ is, this, deja, vu ]</pre>
</div>
<p>The previous example used tokenizer, token filters, and character filters with
their default configurations, but it is possible to create configured versions
of each and to use them in a custom analyzer.</p>
<p>Here is a more complicated example that combines the following:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
Character Filter
</span>
</dt>
<dd>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="analysis-mapping-charfilter.html" title="Mapping character filter">Mapping Character Filter</a>, configured to replace <code class="literal">:)</code> with <code class="literal">_happy_</code> and <code class="literal">:(</code> with <code class="literal">_sad_</code>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">
Tokenizer
</span>
</dt>
<dd>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="analysis-pattern-tokenizer.html" title="Pattern tokenizer">Pattern Tokenizer</a>, configured to split on punctuation characters
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">
Token Filters
</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">Lowercase Token Filter</a>
</li>
<li class="listitem">
<a class="xref" href="analysis-stop-tokenfilter.html" title="Stop token filter">Stop Token Filter</a>, configured to use the pre-defined list of English stop words
</li>
</ul>
</div>
</dd>
</dl>
</div>
<p>Here is an example:</p>
<div class="pre_wrapper lang-ruby alternative">
<pre class="programlisting prettyprint lang-ruby alternative">response = client.indices.create(
index: 'my-index-000001',
body: {
settings: {
analysis: {
analyzer: {
my_custom_analyzer: {
char_filter: [
'emoticons'
],
tokenizer: 'punctuation',
filter: [
'lowercase',
'english_stop'
]
}
},
tokenizer: {
punctuation: {
type: 'pattern',
pattern: '[ .,!?]'
}
},
char_filter: {
emoticons: {
type: 'mapping',
mappings: [
':) => _happy_',
':( => _sad_'
]
}
},
filter: {
english_stop: {
type: 'stop',
stopwords: '_english_'
}
}
}
}
}
)
puts response
response = client.indices.analyze(
index: 'my-index-000001',
body: {
analyzer: 'my_custom_analyzer',
text: "I'm a :) person, and you?"
}
)
puts response</pre>
</div>
<a id="6f34e27481460a95e59ffbacb76bd637"></a>
<div class="pre_wrapper lang-console default has-ruby">
<pre class="programlisting prettyprint lang-console default has-ruby">PUT my-index-000001
{
"settings": {
"analysis": {
"analyzer": {
"my_custom_analyzer": { <a id="CO131-1"></a><i class="conum" data-value="1"></i>
"char_filter": [
"emoticons"
],
"tokenizer": "punctuation",
"filter": [
"lowercase",
"english_stop"
]
}
},
"tokenizer": {
"punctuation": { <a id="CO131-2"></a><i class="conum" data-value="2"></i>
"type": "pattern",
"pattern": "[ .,!?]"
}
},
"char_filter": {
"emoticons": { <a id="CO131-3"></a><i class="conum" data-value="3"></i>
"type": "mapping",
"mappings": [
":) => _happy_",
":( => _sad_"
]
}
},
"filter": {
"english_stop": { <a id="CO131-4"></a><i class="conum" data-value="4"></i>
"type": "stop",
"stopwords": "_english_"
}
}
}
}
}
POST my-index-000001/_analyze
{
"analyzer": "my_custom_analyzer",
"text": "I'm a :) person, and you?"
}</pre>
</div>
<div class="console_widget has-ruby" data-snippet="snippets/381.console"></div>
<div class="calloutlist default has-ruby lang-console">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO131-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>Assigns the index a default custom analyzer, <code class="literal">my_custom_analyzer</code>. This
analyzer uses a custom tokenizer, character filter, and token filter that
are defined later in the request. This analyzer also omits the <code class="literal">type</code> parameter.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO131-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>Defines the custom <code class="literal">punctuation</code> tokenizer.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO131-3"><i class="conum" data-value="3"></i></a></p>
</td>
<td align="left" valign="top">
<p>Defines the custom <code class="literal">emoticons</code> character filter.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO131-4"><i class="conum" data-value="4"></i></a></p>
</td>
<td align="left" valign="top">
<p>Defines the custom <code class="literal">english_stop</code> token filter.</p>
</td>
</tr>
</table>
</div>
<p>The above example produces the following terms:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ i'm, _happy_, person, you ]</pre>
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