slow-J commented on code in PR #12797:
URL: https://github.com/apache/lucene/pull/12797#discussion_r1399736567


##########
lucene/core/src/java/org/apache/lucene/index/CheckIndex.java:
##########
@@ -4051,15 +4057,30 @@ public static Options parseOptions(String[] args) {
     int i = 0;
     while (i < args.length) {
       String arg = args[i];
-      if ("-fast".equals(arg)) {
-        opts.doChecksumsOnly = true;
+      if ("-detailLevel".equals(arg)) {
+        if (i == args.length - 1) {
+          throw new IllegalArgumentException("ERROR: missing value for 
-detailLevel option");
+        }
+        i++;
+        int detailLevel = Integer.parseInt(args[i]);
+        if (detailLevel < DetailLevel.MIN_VALUE || detailLevel > 
DetailLevel.MAX_VALUE) {
+          throw new IllegalArgumentException(
+              String.format(
+                  "ERROR: value for -detailLevel option is out of bounds. 
Please use a value "
+                      + "from '%d'->'%d'",
+                  DetailLevel.MIN_VALUE, DetailLevel.MAX_VALUE));
+        }
+        opts.detailLevel = detailLevel;
+      } else if ("-fast".equals(arg)) {
+        System.err.println("-fast is deprecated, verifying file checksums only 
is now the default");
+      } else if ("-slow".equals(arg)) {
+        System.err.println("-slow is deprecated, use '-detailLevel 3' instead 
for slow checks");
+        opts.detailLevel = DetailLevel.MIN_LEVEL_FOR_SLOW_CHECKS;
       } else if ("-exorcise".equals(arg)) {
         opts.doExorcise = true;
       } else if ("-crossCheckTermVectors".equals(arg)) {
-        System.err.println("-crossCheckTermVectors is deprecated, use -slow 
instead");
-        opts.doSlowChecks = true;
-      } else if ("-slow".equals(arg)) {
-        opts.doSlowChecks = true;
+        System.err.println("-crossCheckTermVectors is deprecated, use 
'-detailLevel 3' instead");

Review Comment:
   Thanks @rmuir, will add an entry to `MIGRATE.md` and will leave the 
deprecated params for now, setting for removal in Lucene 11.



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