The provided information describes the vulnerability (CVE-2022-23712) as an improper check for unusual or exceptional conditions in Elasticsearch, allowing an unauthenticated attacker to trigger a node shutdown via a crafted network request. However, the GitHub patch details, commit diffs, or specific code references are explicitly marked as 'Not available' in the input. Without access to the patched code or explicit documentation of the affected functions (e.g., from release notes or vulnerability reports), it is impossible to identify the exact vulnerable functions with high confidence. The vulnerability likely resides in request-handling logic or input validation for network requests, but the lack of code-level evidence prevents precise identification of the functions involved.