The problem is not with ES but with SHC, more specifically, with the KV Store. The replication is fragile and prone to breakdowns and losing sync. During this situation is is common for it to become corrupt and unrecoverable. it is also common for recovery steps to result in permanent corruption/loss. In some environments, this is merely easily reproducible lookups, but in ES, the KVStore contains most of your configurations, customizations, and history, including your incidents, and glass tables. So if you lose KVStore, you lose almost EVERYTHING and have to start from scratch. This is too big a risk to make SHC on ES sensible except in the most dire situations, and even then a strict KVStore backup regimen must be put in place AND TESTED!!!
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