WARNING: Version 2.4 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.
Prior to 2.4, validation was not performed upon creation of an index template. Rather, the index template was validated upon index creation after all matching templates were fully merged.
Each index template must now be independently valid prior to merging. This means,
for example, that you can no longer reference
tokenizers from a shared template.