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update aggregations.md re: rollup (#4455) 

noted that rollup could be on or off
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jeffhartley 2017-06-23 14:28:59 -07:00 committed by Fangjin Yang
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docs/content/querying/aggregations.md
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@ -17,7 +17,7 @@ Available aggregations are:
```
Please note the count aggregator counts the number of Druid rows, which does not always reflect the number of raw events ingested.
This is because Druid rolls up data at ingestion time. To
This is because Druid can be configured to roll up data at ingestion time. To
count the number of ingested rows of data, include a count aggregator at ingestion time, and a longSum aggregator at
query time.