Nested_path and Nested_filter are deprecated

[kplazinski]

NEST/Elasticsearch.Net version:
6.0

Elasticsearch version:
6.1.3

Description of the problem including expected versus actual behavior:
When using Elastic Search 6.1.3 & Nest 6.0 in SortDescriptor for NestedPath & NestedFilter we get the deprecations alerts

#! Deprecation: [nested_path] has been deprecated in favor of the [nested] parameter
#! Deprecation: [nested_filter] has been deprecated in favour for the [nested] parameter

Steps to reproduce:
Try to create SortDescriptor object
It's not possible to do proper [nested] parameter using Nest 6.0

[russcam]

Thanks for reporting @vicariouskp. They are only deprecations, so the functionally, they continue to work as expected.

I've opened Issue #3178 and PR #3180 to address so am going to close this in favour of tracking on #3178 (I would have tracked it on this issue, but I opened a new one before seeing this 😢 )