Elastic Search Hyphen issue with term filter

I have the following Elastic Search query with only a term filter. My query is much more complex but I am just trying to show the issue here.

{
    "filter": {
            "term": {
                    "field": "update-time"
                }
        }
}

When I pass in a hyphenated value to the filter, I get zero results back. But if I try without an unhyphenated value I get results back. I am not sure if the hyphen is an issue here but my scenario makes me believe so.

Is there a way to escape the hyphen so the filter would return results? I have tried escaping the hyphen with a back slash which I read from the Lucene forums but that didn't help.

Also, if I pass in a GUID value into this field which is hyphenated and surrounded by curly braces, something like - {ASD23-34SD-DFE1-42FWW}, would I need to lower case the alphabet characters and would I need to escape the curly braces too?

Thanks