Hi, following comment is mentioned in https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/util/fst/package-info.java .
"Input values (keys). These must be provided to Builder in Unicode code point (UTF8 or UTF32) sorted order. Note that sorting by Java's String.compareTo, which is UTF16 sorted order, is not correct and can lead to exceptions while building the FST" Can someone please suggest how to achieve this?