What is Elasticsearch analyzer?
The constituent of analyzers includes a tokenizer which is preceded by the Char filters and 1 or 0 token filters. On the name of API or any other mapping definition, the analytical module also refers to the analyzers. In Elasticsearch, analyzers are already provided which are ready for the user to apply. Users are also allowed to create custom analyzers and built token filters or characters accordingly.
Elasticsearch interview question on your own to get a better understanding.