ElasticSearch converting the text to lowercase

Question

I have not specified any analyzer and I have a field which has a hex. String where all the letters present are being converted to lower case.

How do I stop it (what's analyzer/token filter should be used)?

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

If an analyzer is not specified then the default standard analyzer and the keyword analyzer are applied, they do the following:

Standard Analyzer

The standard analyzer divides text into terms on word boundaries, as defined by the Unicode Text Segmentation algorithm. It removes most punctuation, lowercases terms, and supports removing stop words.

Keyword Analyzer

The keyword analyzer is a “noop” analyzer that accepts whatever text it is given and outputs the exact same text as a single term.

https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-analyzers.html

To access the no-op (no operation) keyword analyzer where case is preserved add .keyword to the end of the field name like so:

{
  "query": {
    "term" : { 
      "hex_value.keyword" : "#00FF00" 
    } 
  }
}

This will perform the case sensitive search sought after.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Mar 7, 2019 at 19:30

Joshua Robinson

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