500 Internal Server Error: no such index [Default]

Autocomplete suggestions for filters have started causing 500 Internal Server Errors

Request:

POST https://example.com/kibana/api/kibana/suggestions/values/Default

{"query":"","field":"hostname.keyword","boolFilter":[]}

Response:

{"statusCode":500,
 "error":"Internal Server Error",
 "message":"[index_not_found_exception] no such index [Default], with { resource.type=\"index_or_alias\" & resource.id=\"Default\" & index_uuid=\"_na_\" & index=\"Default\" }"}

Server log:

 error  [12:03:56.506]  Error: Internal Server Error
    at HapiResponseAdapter.toError (/usr/share/kibana/src/core/server/http/router/response_adapter.js:132:19)
    at HapiResponseAdapter.toHapiResponse (/usr/share/kibana/src/core/server/http/router/response_adapter.js:86:19)
    at HapiResponseAdapter.handle (/usr/share/kibana/src/core/server/http/router/response_adapter.js:81:17)
    at Router.handle (/usr/share/kibana/src/core/server/http/router/router.js:162:34)
    at process._tickCallback (internal/process/next_tick.js:68:7)

Kibana 7.9.2

Hello,

Where are you see these errors? In dev tools console on Kibana?

Thanks
Bhavya

Correct.