WARNING: Version 1.6 of Elasticsearch has passed its EOL date.
This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.
Character filters are used to preprocess the string of
characters before it is passed to the tokenizer.
A character filter may be used to strip out HTML markup, , or to convert
"&" characters to the word
Elasticsearch has built in characters filters which can be used to build custom analyzers.