How to recover index

In my test, I was running with a single shard and no replica for test
index. Just before storage running out of disk space, it was all OK.

health index pri rep docs.count docs.deleted store.size pri.store.size
green test_insert 1 0 23307898 0 95.6gb 95.6gb

However after the disk was full, no documents counts are reported.

health index pri rep docs.count docs.deleted store.size pri.store.size
red test_insert 1 0

Storage had some room created afterwards :
before :
/dev/sda 100666 99058 569 100% /iscsi_disk1
After :
/dev/sda 100666 89480 10147 90% /iscsi_disk1

But index did not recover on it;s own. Is it possible to recover the index
from this state ?

Thanks
Ajay

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