steffenvan commented on code in PR #1071:
URL: https://github.com/apache/jackrabbit-oak/pull/1071#discussion_r1318360063


##########
oak-lucene/src/main/java/org/apache/jackrabbit/oak/plugins/index/lucene/LuceneDocumentMaker.java:
##########
@@ -315,6 +313,38 @@ protected boolean indexTypeOrderedFields(Document doc, 
String pname, int tag, Pr
         }
         return fieldAdded;
     }
+    
+    protected static BytesRef checkTruncateLength(String prop, String value, 
String path, int maxLength) {
+        log.trace("Property {} at path:[{}] has value {}", prop, path, value);
+
+        BytesRef ref = new BytesRef(value);
+        if (ref.length <= maxLength) {
+            return ref;
+        }
+        log.info("Truncating property {} at path:[{}] as length after encoding 
{} is > {} ",
+            prop, path, ref.length, maxLength);
+        int end = maxLength - 1;
+        // skip over tails of utf-8 multi-byte sequences (up to 3 bytes)
+        while ((ref.bytes[end] & 0b11000000) == 0b10000000) {

Review Comment:
   Could we add examples of these skipping and removals of multi-byte 
sequences? And also add explanations for why they are necessary? 



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