Group by time interval

I have a one hour data in my index.I want to get group the data by its time field ('logged_time_unix').here is my query

[aggs] => Array
(
[viewTimeBy] => Array
(
[terms] => Array
(
[field] => logged_time_unix
[size] => 20000
)
)
)

after this query i got values grouped by time, but there are lot of time values(minute wise points)...I just wanted 5 grouping within 1 hour...how to do that ? anyone help me......

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