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Currently there is no mechanism to clean up ElasticSearch Indices. That means the grow infinitely and searches will slow down. IBM provides scripts to clean up this indices with the delete_by_query api which deletes all documents older than a specified time. This has some disadvantages i have to do this regularly and have to set up an automation to do this. Moreover, ElasticSearch does not reclaim the space because it only marks the documents as deleted (https://www.elastic.co/de/blog/lucenes-handling-of-deleted-documents). Furthermore, when i want more shards for an certain index i have to split and clone them with index rotation in place i would just adjust the number of shard for an "index set" and new indices will be created with this number of shard and the older ones will be deleted after some time.
Graylog is doing this already with the index sets feature (https://docs.graylog.org/docs/index-model). We realy like their implementation because you get more control of your data. It would be helpful to get such a feature for instana as well.
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