I have found the reason at the following links
In 8.0, we’ve made several changes to protect system indices from direct access. To access a system index, you must now have the allow_restricted_indices permission set to true.
I have found the reason at the following links
In 8.0, we’ve made several changes to protect system indices from direct access. To access a system index, you must now have the allow_restricted_indices permission set to true.
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