Java Checkstyle reports formatting as a warning, not an error despite my explicit severity

1. Checkstyle

   1 17 8,658 9.9 Java

   Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

   

   I'm trying to use Google's checkstyle. I want certain things to be an error, such as using Tabs for indentation. When I run mvn checkstyle:check with a file with a tab in the first column, it always gives a [WARN] rather than the error that I've asked for. Pom snippet: org.apache.maven.plugins maven-surefire-plugin ${maven-surefire-plugin.version} ${maven-surefire-plugin.skipUnitTests} org.apache.maven.plugins maven-checkstyle-plugin 3.1.2 checkstyle validate check google_checks.xml UTF-8 true true warning true I'm using google_checks.xml as from https://github.com/checkstyle/checkstyle/blob/master/src/main/resources/google_checks.xml. I have changed the severity for the FileTabCharacter to "error"

2. InfluxDB

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