What is the use of analyzer in Elasticsearch and why we need to go for that?

Elastic Stack Elasticsearch
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Can anyone explain about what is the use of analyzer and why we need to go for that?

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Have you had a look at the documentation? If not, I would recommend starting with the following:

https://www.elastic.co/guide/en/elasticsearch/guide/2.x/analysis-intro.html

https://www.elastic.co/guide/en/elasticsearch/reference/5.2/analysis.html#analysis

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