Make assemblies CLS-compliant

[ghost]

Please add [assembly: CLSCompliant(true)] to Nest and Elasticsearch.Net.

[Mpdreamz]

The reason I left it out was that I never personally needed it but have no reservations adding it in.

Is there a verifier that I can use that the client IS actually CLSCompliant ?

Also interested to hear your use case that needs it!

[Mpdreamz]

Elasticsearch.Net is now CLSCompliant (also fixed all the resulting warnings)

Nest CLSCompliancy blocks on the work being done in this branch https://github.com/elasticsearch/elasticsearch-net/tree/feature/exposable-query-dsl

That replaces all the internal properties prefixed with an underscore with explicit interface implementations.

NEST with CLSCompliant now has 34 compiler warnings