How to check for the existince of at least one document in a container that satisfies a condition?

I would like to determine if at least one document exist that matches the where clause. I don't need the count. And I don't need the documents. And I prefer cosmosDb to stop looking once anything is found. So it should be faster / cheaper than count(). Maybe something like this but better. Linq solutions would be fine too.

SELECT
  value true
FROM 
  aContainer c
WHERE 
  c.aField = @aValue and
  c.anotherField = @anotherValue
OFFSET 0 LIMIT 1

or

var exists = await _aContainer.GetItemLinqQueryable<EnrollmentDate>(true)
  .Any(r=>r.aField == value && r.anotherField == @anotherValue);

You can use the following linq statement.

var feed = container
    .GetItemLinqQueryable<EnrollmentDate>()
    .Where(x => !x.Id.IsNull()) // your own filter
    .Select(x => 1)
    .Take(1)
    .ToFeedIterator();

var anyResult = false;
while (feed.HasMoreResults)
{
    foreach (var item in await feed.ReadNextAsync())
    {
        anyResult = true;
    }
}

Which will generate the following query:

SELECT TOP 1 VALUE 1 FROM root WHERE ...