Better handling of exception at Index creation

[qcoumes]

Currently, a lot of errors are catched as an "Already exists", event completely different problem:

opensearchpy.exceptions.RequestError: RequestError(400, 'illegal_argument_exception', 'enable_position_increments is not supported anymore. Please fix your analysis chain')
Creating index 'patient'... Error (already exists)
exiting..

The exception handling code here :

django-opensearch-dsl/django_opensearch_dsl/management/commands/opensearch.py

Lines 126 to 132 in b5fc53d

	except opensearchpy.exceptions.RequestError:
	if verbosity or not ignore_error:
	self.stderr.write(
	f"{pp} index '{index._name}'... {self.style.ERROR('Error (already exists)')}") # noqa
	if not ignore_error:
	self.stderr.write("exiting...")
	exit(1)

must be modified to better report any error.