add modifiers to log

Signed-off-by: Joanne Wang <jowg@amazon.com>

src/main/java/org/opensearch/securityanalytics/rules/objects/SigmaDetectionItem.java

@@ -116,7 +116,7 @@ public static <T> SigmaDetectionItem fromMapping(String key, Either<T, List<T>>
             // throws an error if sigmaType is an empty string and the modifier is "contains" or "startswith" or "endswith"
             boolean invalidModifierWithEmptyString = modifierIds.contains("contains") || modifierIds.contains("startswith") || modifierIds.contains("endswith");
             if (sigmaType.getClass().equals(SigmaString.class) && v.toString().isEmpty() && invalidModifierWithEmptyString) {
-                throw new SigmaValueError("Cannot create rule with empty string and given modifier(s)");
+                throw new SigmaValueError("Cannot create rule with empty string and given modifier(s): " + modifierIds);
             } else {
                 sigmaTypes.add(sigmaType);
             }