When I run a query - such as the below - against the Json endpoint the spelling suggestion comes back with the meta data field in the spelling.text field...
search.json?collection=wat&queryscieence=&profile=_default&meta_metaDataField_not=true
"spell": {
"url": "query=science+-metaDataField%3Atrue&collection=wat&profile=_default",
"text": "science -metaDataField:true"
},
That's not so useful, for something like a "Did you mean 'science'?