Every entry in the document has a username, starttimeISO and uuid (which is not starttimeiso)
So every record has a starttimeISO which is the time when the username was
seen.
The document looks like this:
{
Uuid: xxx
StartTimeISO: 2015-01-18T00:00:00.000Z
Username: abc
}
There are multiple records in the document.
Indexing is applied on "username" and "starttimeiso" fields.
