A few examples of index recalc performance differences: 

In 1.1.6
...
2015-09-04_03:56:38.19431 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_2075] in [9ms].
2015-09-04_03:56:38.20487 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1800] in [10ms].
2015-09-04_03:56:38.21176 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1802] in [6ms].
2015-09-04_03:56:38.22028 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1801] in [8ms].
2015-09-04_03:56:38.23003 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1808] in [9ms].
2015-09-04_03:56:38.23855 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1807] in [8ms].
2015-09-04_03:56:38.24877 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1809] in [10ms].
2015-09-04_03:56:38.26011 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1804] in [11ms].
2015-09-04_03:56:38.26902 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1803] in [8ms].
2015-09-04_03:56:38.28049 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1806] in [11ms].
2015-09-04_03:56:38.29289 INFO  [RebuildIndexRangesJob] Calculated range of 
[graylog_1805] in [12ms].
2015-09-04_03:56:38.41557 INFO  [RebuildIndexRangesJob] Done calculating 
index ranges for 800 indices. Took 10608ms.

In 1.2.1:
...
2015-10-03_17:00:59.70210 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3358] in [1609ms].
2015-10-03_17:01:05.63202 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3357] in [50ms].
2015-10-03_17:01:08.85062 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3359] in [47ms].
2015-10-03_17:01:12.39922 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3365] in [119ms].
2015-10-03_17:01:15.80573 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3364] in [40ms].
2015-10-03_17:01:19.29222 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3367] in [43ms].
2015-10-03_17:01:22.98674 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3366] in [142ms].
2015-10-03_17:01:29.74936 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3361] in [120ms].
2015-10-03_17:01:34.11754 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3360] in [128ms].
2015-10-03_17:01:37.91544 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3363] in [134ms].
2015-10-03_17:01:41.41116 INFO  [EsIndexRangeService] Calculated range of 
[graylog_3362] in [237ms].
2015-10-03_17:01:45.31576 INFO  [RebuildIndexRangesJob] Done calculating 
index ranges for 1855 indices. Took 9551409ms.

For good measure, I tried scaling the ES cluster up and down. Performance 
is exactly the same whether I run on a single large server vs 4 smaller 
servers.

On Friday, October 2, 2015 at 9:29:37 AM UTC-6, Jesse Skrivseth wrote:
>
> Note that for the 1800 indices we have in this instance, the ~5 second 
> delay between each index during range calculation adds up to ~150 minutes 
> of additional delay when calculating ranges. My "> 20 minutes" comment 
> should be more like "> 2.5 hours", plus actual time spent calculating 
> ranges. 
>

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