ES8 fix for the hub release step

[newgene]

This error shows at the "Release" tab when the deployment ES is v8.x:

The error is related to these two util functions:

biothings.api/biothings/utils/es.py

Lines 343 to 387 in bb89c4d

	def get_mapping(self):
	"""return the current index mapping"""
	if self._host_major_ver <= 6:
	m = self._es.indices.get_mapping(
	index=self._index,
	doc_type=self._doc_type,
	)
	return m[self._index]["mappings"]
	elif self._host_major_ver == 7:
	m = self._es.indices.get_mapping(
	index=self._index
	)
	# fake the mapping doc_type
	m = {
	self._doc_type: m[self._index]["mappings"]
	}
	return m
	else:
	raise RuntimeError(f"Server Elasticsearch version is {self._host_major_ver} "
	"which is unsupported when using old ESIndexer class")
	def update_mapping(self, m):
	if self._host_major_ver <= 6:
	assert list(m) == [
	self._doc_type], "Bad mapping format, should have one doc_type, got: %s" % list(
	m)
	assert 'properties' in m[
	self._doc_type], "Bad mapping format, no 'properties' key"
	return self._es.indices.put_mapping(
	index=self._index, doc_type=self._doc_type, body=m
	)
	elif self._host_major_ver == 7:
	# this is basically guessing based on heuristics
	if len(m) == 1:
	if 'properties' not in m: # basically {'_doc': mapping}
	m = next(iter(m.values())) # take out the mapping
	else: # basically just the mapping or type: properties
	pass # ignoring the possibility of doc_type='properties'
	else: # we don't expect {} as input, so len(m) > 1
	if 'properties' not in m:
	raise RuntimeError(f"Possibly invalid mapping {m}")
	return self._es.indices.put_mapping(index=self._index, body=m)
	else:
	raise RuntimeError(f"Server Elasticsearch version is {self._host_major_ver} "
	"which is unsupported when using old ESIndexer class")

[newgene]

fixed in newgene#13