Stream analytics time agnostic processing

Question

my stream analytics jobs is not generating any output and watermark delay matrix keeps on increasing. for all other metrices like Input events, output events, cpu%(increases to 10%), runtime error, data conversion error there is no change (value is zero).

Input stream: 2 gb file in ADLS gen2. with file having multiple JSON objects (not JSON array) Sample data:

{"a":"1"} //row 1
{"a":"2"}  // row 2
{"a":"1"} // row 3

The data doesn't have any time field to indicate event time.

output stream: Cosmos db

late event set to 5 sec out of order event set to 25 sec.

Expected output: i want job to write to output every X mins. current output: job is not writing any data to output and all metric values are zero

Thanks