Set Accept header when format set on Cat APIs #4269
Merged
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This commit updates the ApiGenerator to set the Accept HTTP header when the format
header is specified. To determine whether an API call is successful, the Content-Type header
of the response is checked against the Accept header of the request.
The format parameter only really makes sense for the low level client and associated
ElasticsearchResponse types, as the high level client always expects to deserialize
from JSON; any other format will result in an exception at deserialization.
Fixes #4243