I'm planning to use single node cluster of Elasticsearch. I would like to know if we can take file system level backup if the Elasticsearch is proposing one node one path?
No. The docs are very clear on the subject:
WARNING: The only reliable and supported way to back up a cluster is by taking a snapshot . You cannot back up an Elasticsearch cluster by making copies of the data directories of its nodes. There are no supported methods to restore any data from a filesystem-level backup. If you try to restore a cluster from such a backup, it may fail with reports of corruption or missing files or other data inconsistencies, or it may appear to have succeeded having silently lost some of your data.
This guidance applies to clusters of all sizes.
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