Resolve "Die Statistiken sollten auch in ElasticSearch hinterlegt werden."

Related to #384 (closed)

.settings/org.eclipse.jdt.core.prefs

@@ -57,6 +57,7 @@ org.eclipse.jdt.core.compiler.problem.nullReference=warning
 org.eclipse.jdt.core.compiler.problem.nullSpecViolation=warning
 org.eclipse.jdt.core.compiler.problem.potentialNullReference=warning
 org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.problem.syntacticNullAnalysisForFields=enabled
 org.eclipse.jdt.core.compiler.processAnnotations=enabled
 org.eclipse.jdt.core.compiler.release=disabled
 org.eclipse.jdt.core.compiler.source=11