You can add more storage, expand the cluster, delete some data or simply override the default watermark settings in your config. While indexing Elasticsearch need extra disk space for merging, so try to not be overly aggressive if you go with the last option as this could cause severe problems down the line.
You can also try to make sure your data is compressed as well as possible by making sure you mappings are optimized and that you do not have a loti of very small shards.
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