Remove unused method

Signed-off-by: Craig Perkins <[email protected]>

server/src/main/java/org/opensearch/common/regex/Regex.java

@@ -93,23 +93,6 @@ public static Automaton simpleMatchToAutomaton(String... patterns) {
         return Operations.union(automata);
     }
 
-    /**
-     *
-     * @param str - The input string to remove adjacent duplicate characters from
-     * @param target - The target character to remove duplicates of
-     * @return - string with adjacent duplicates of the target character removed
-     */
-    static String removeAdjacentDuplicates(String str, char target) {
-        StringBuilder sb = new StringBuilder();
-        for (char c : str.toCharArray()) {
-            int size = sb.length();
-            if (size == 0 || c != target || sb.charAt(size - 1) != c) {
-                sb.append(c);
-            }
-        }
-        return sb.toString();
-    }
-
     /**
      * Match a String against the given pattern, supporting the following simple
      * pattern styles: "xxx*", "*xxx", "*xxx*" and "xxx*yyy" matches (with an

server/src/test/java/org/opensearch/common/regex/RegexTests.java

@@ -123,12 +123,4 @@ public void testSimpleMatch() {
             assertFalse("[" + pattern + "] should not match [" + matchingString + "]", Regex.simpleMatch(pattern, matchingString));
         }
     }
-
-    public void testRemoveDuplicates() {
-        assertEquals("*", Regex.removeAdjacentDuplicates("***", '*'));
-        assertEquals("*abc*", Regex.removeAdjacentDuplicates("**abc**", '*'));
-        assertEquals("a*b*c*", Regex.removeAdjacentDuplicates("a*b**c****", '*'));
-        assertEquals("*abc", Regex.removeAdjacentDuplicates("****abc", '*'));
-        assertEquals("*", Regex.removeAdjacentDuplicates("*".repeat(100), '*'));
-    }
 }