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The "Hikari Pool Shutdown" error in Spring Boot indicates that the connection pool managed by HikariCP, a popular connection pooling library in Java, has been shut down. This can occur for various reasons, such as the database server being unavailable, a misconfiguration of the connection pool, or a network issue. When this error occurs, it means that the application can no longer establish a connection to the database, and any database-related operations will fail.