aws.elasticsearch Error Scanning More Than 5 domains

[jtroberts83]

Describe the bug
When running any elasticsearch policy on an account region with more than 5 elasticsearch domains the policy now bombs out with the error - error:An error occurred (ValidationException) when calling the DescribeElasticsearchDomains operation: Please provide a maximum of 5 Elasticsearch domain names to describe.

To Reproduce
Create 6 es domains and run an elasticsearch c7n policy, error will occur

Expected behavior
It should chunk the calls into domains of 5 or less

Background (please complete the following information):

• OS: Ubuntu v20
• Python Version: 3.8
• Custodian Version: 0.9.2.0
• Tool Version: [if applicable]
• Cloud Provider: aws
• Policy: any policy which queries ES
• Traceback:

[ERROR]	2020-05-22T14:51:25.978Z	9ef7929b-b494-434e-9f9f-dfdfdfdfdfdfd Error while executing policy
Traceback (most recent call last):
  File "/var/task/c7n/policy.py", line 291, in run
    resources = self.policy.resource_manager.resources()
  File "/var/task/c7n/query.py", line 466, in resources
    resources = self.augment(resources)
  File "/var/task/c7n/query.py", line 521, in augment
    return self.source.augment(resources)
  File "/var/task/c7n/resources/elasticsearch.py", line 48, in augment
    return _augment(domains)
  File "/var/task/c7n/resources/elasticsearch.py", line 39, in _augment
    resources = self.manager.retry(
  File "/var/task/c7n/utils.py", line 373, in _retry
    return func(*args, **kw)
  File "/var/task/botocore/client.py", line 316, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/var/task/botocore/client.py", line 635, in _make_api_call
    raise error_class(parsed_response, operation_name)
botocore.errorfactory.ValidationException: An error occurred (ValidationException) when calling the DescribeElasticsearchDomains operation: Please provide a maximum of 5 Elasticsearch domain names to describe.

• custodian version --debug output

Additional context
Seems to be introduced with 0.9.2.0

[PratMis]

We're also running into this issue. thanks for reporting @jtroberts83

[kapilt]

fix merged, I'll queue up a micro release

[PratMis]

Thanks @kapilt