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add ilm forecast example

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Thomas von Dein
2026-06-26 11:41:55 +02:00
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@@ -433,6 +433,40 @@ $ esctl search -i hyperdrive -l 2 | jq
}
```
There are also some uniq features which are not directly available via
the ES API or GUI. Here's one example: say you have a number of
indices with ILM policies each. At some day there were a surge in
incoming data in some of them and you want to know, when the excess
data will be rolled over to cold storage:
```console
$ esctl ilm forecast sh -f warm -w 3d
1.1 TB bytes of data in warm phase will be rolled within 72h0m0s to the next phase
```
You may also look at a detailed ilm forecast list:
```console
$ esctl ilm forecast ls -f warm -w 3d
INDEX CURRENT-SIZE CURRENT-AGE VIRTUAL-AGE MIN-AGE MIN-SIZE CURRENT-PHASE NEXT-PHASE
foobar-n1-p01-elastic-000126 12 GB 2d:8h:12m 3d:5h:16m 7d 25 GB hot warm
foobar-n1-p01-misc-000070 16 GB 5d:16h:31m 4d:10h:31m 7d 25 GB hot warm
foobar-n1-q01-elastic-000122 23 GB 5d:0h:11m 6d:10h:33m 7d 25 GB hot warm
foobar-n1-q01-misc-000072 18 GB 6d:15h:21m 4d:21h:36m 7d 25 GB hot warm
delaware-f1-p01-kafka-000023 1.3 MB 15h:12m 0s 7d 25 GB hot warm
delaware-f1-p01-misc-000024 17 GB 6d:16h:1m 4d:16h:33m 7d 25 GB hot warm
delaware-f1-q01-kafka-000023 1.5 MB 15h:12m 0s 7d 25 GB hot warm
delaware-f1-q01-misc-000024 16 GB 6d:15h:31m 4d:13h:52m 7d 25 GB hot warm
delaware-n1-p01-elastic-000417 16 GB 12h:42m 4d:10h:31m 7d 25 GB hot warm
```
So you can see, which index will be rolled over when. Note the
**VIRTUAL-AGE** field however: it is calculated from the current
storage usage of the index in relation to rollover max shard size. So
you can see, when an index will be rolled over either because it aged
out or because its storage exceeded the limit.
---
Please note, that `esctl` is still in its early stages and things are
changing heavily every now and then. New commands are being added
constantly as well.