WARNING: Version 6.0 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.
In 6.0, Synonym Token Filter tokenizes synonyms with whatever tokenizer and token filters appear before it in the chain.
ignore_case parameters are deprecated
and will be ignored when used in new indices. These parameters
will continue to function as before when used in indices
created in 5.x.