Fixing ElasticSearch 'No handler for type [int] declared on field ...'


You want to create an index with a custom mapping in ElasticSearch but you see an error message like this:

elasticsearch.exceptions.RequestError: RequestError(400, 'mapper_parsing_exception', 'No handler for type [int] declared on field [id]')


You likely have a mapping like

"id": {
    "type":  "int"

in your mapping properties.

The issue here is int: ElasticSearch uses integer as type of integers, not int!

In order to fix the issue, change the property to

"id": {
    "type":  "integer"

and retry creating the index.