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<h2 class="title"><a id="analysis-analyzers"></a>Analyzers<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.3/docs/reference/analysis/analyzers.asciidoc">edit</a></h2>
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<p>Analyzers are composed of a single <a class="xref" href="analysis-tokenizers.html" title="Tokenizers">Tokenizer</a>
and zero or more <a class="xref" href="analysis-tokenfilters.html" title="Token Filters">TokenFilters</a>. The tokenizer may
be preceded by one or more <a class="xref" href="analysis-charfilters.html" title="Character Filters">CharFilters</a>.
The analysis module allows you to register <code class="literal">Analyzers</code> under logical
names which can then be referenced either in mapping definitions or in
certain APIs.</p>
<p>Elasticsearch comes with a number of prebuilt analyzers which are
ready to use. Alternatively, you can combine the built in
character filters, tokenizers and token filters to create
<a class="xref" href="analysis-custom-analyzer.html" title="Custom Analyzer">custom analyzers</a>.</p>
<h3><a id="default-analyzers"></a>Default Analyzers<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.3/docs/reference/analysis/analyzers.asciidoc">edit</a></h3>
<p>An analyzer is registered under a logical name. It can then be
referenced from mapping definitions or certain APIs. When none are
defined, defaults are used. There is an option to define which analyzers
will be used by default when none can be derived.</p>
<p>The <code class="literal">default</code> logical name allows one to configure an analyzer that will
be used both for indexing and for searching APIs. The <code class="literal">default_search</code>
logical name can be used to configure a default analyzer that will be
used just when searching (the <code class="literal">default</code> analyzer would still be used for
indexing).</p>
<p>For instance, the following settings could be used to perform exact matching
only by default:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">index :
analysis :
analyzer :
default :
tokenizer : keyword</pre>
</div>
<h3><a id="aliasing-analyzers"></a>Aliasing Analyzers<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.3/docs/reference/analysis/analyzers.asciidoc">edit</a></h3>
<p>Analyzers can be aliased to have several registered lookup names
associated with them. For example, the following will allow
the <code class="literal">standard</code> analyzer to also be referenced with <code class="literal">alias1</code>
and <code class="literal">alias2</code> values.</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">index :
analysis :
analyzer :
standard :
alias: [alias1, alias2]
type : standard
stopwords : [test1, test2, test3]</pre>
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<p>Below is a list of the built in analyzers.</p>
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