Disable diagnostics for one of the langservers

[miuirussia]

Is it possible to do this now or does it need a new feature?

[prabirshrestha]

You can define a custom function to get the capabilities.

vim-lsp/doc/vim-lsp.txt

Lines 760 to 771 in 296fb98

	g:lsp_get_supported_capabilities *g:lsp_get_supported_capabilities*
	Type: |List|
	Default: `[function('lsp#default_get_supported_capabilities')]`
	A |List| containing one element of type |Funcref|. This element is a
	reference to the function that vim-lsp should use to obtain the supported
	LSP capabilities. Changing this variable allows customizing which
	capabilities vim-lsp sends to a language server.
	Note: You can obtain the default supported capabilities of vim-lsp by
	calling `lsp#omni#default_get_supported_capabilities` from within your
	function.

If you are registering a server you can also pass capabilities. Here is a similar one with code samples that you could use. #1056