Thank you !! The following command you gave what I wanted.
your current search giving field Location, Processing_time, trans_date
| bucket span=10 Processing_time
| stats count by trans_date Processing_time
| eventstats sum(count) as Total by trans_date
| eval Percent=round(count*100/Total,2)
| table trans_date, Processing_time Percent
| rename Processing_time as DurationBucket | xyseries trans_date DurationBucket Percent
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