Backup ElasticSearch data using GCS unexpectedly crashed

Hi,

I had set up ES automatically to make backup of the indices to a Google Cloud Storage repo.
Everything was working fine until unexpectedly crashed.
I executed the command "elasticsearch-keystore list"to list the available keys for the service account that I use to store the indices into the bucket and is missing.

Does anyone knows how and why the json key was deleted without human intervention?
Is there any life-cycle period for the keys?
Anyone with similar experience on the same incident?

My ES version based on the curl -XGET 'localhost:9200' output is:

"version" : {
    "number" : "6.4.0"

Thanks!

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