[[configuring-analyzers]] === Configuring Analyzers

The third important index setting is the analysis section,((("index settings", "analysis"))) which is used to configure existing analyzers or to create new custom analyzers specific to your index.

In <>, we introduced some of the built-in ((("analyzers", "built-in")))analyzers, which are used to convert full-text strings into an inverted index, suitable for searching.

The standard analyzer, which is the default analyzer used for full-text fields,((("standard analyzer", "components of"))) is a good choice for most Western languages.((("tokenization", "in standard analyzer")))((("standard token filter")))((("stop token filter")))((("standard tokenizer")))((("lowercase token filter"))) It consists of the following:

• The standard tokenizer, which splits the input text on word boundaries
• The standard token filter, which is intended to tidy up the tokens emitted by the tokenizer (but currently does nothing)
• The lowercase token filter, which converts all tokens into lowercase
• The stop token filter, which removes stopwords--common words that have little impact on search relevance, such as a, the, and, is.

By default, the stopwords filter is disabled. You can enable it by creating a custom analyzer based on the standard analyzer and setting the stopwords parameter.((("stopwords parameter"))) Either provide a list of stopwords or tell it to use a predefined stopwords list from a particular language.

In the following example, we create a new analyzer called the es_std analyzer, which uses the predefined list of ((("Spanish", "analyzer using Spanish stopwords")))Spanish stopwords:

[source,js]

PUT /spanishdocs { "settings": { "analysis": { "analyzer": { "es_std": { "type": "standard", "stopwords": "_spanish" } } } }

}

// SENSE: 070_Index_Mgmt/15_Configure_Analyzer.json

The es_std analyzer is not global--it exists only in the spanish_docs index where we have defined it. To test it with the analyze API, we must specify the index name:

[source,js]

GET /spanish_docs/_analyze?analyzer=es_std

El veloz zorro marrón

// SENSE: 070_Index_Mgmt/15_Configure_Analyzer.json

The abbreviated results show that the Spanish stopword El has been removed correctly:

[source,js]

{ "tokens" : [ { "token" : "veloz", "position" : 2 }, { "token" : "zorro", "position" : 3 }, { "token" : "marrón", "position" : 4 } ]

}