Fix normalization in TeluguAnalyzer (#13059)

DecimalDigitFilter and IndicNormalizationFilter were mistakenly omitted.

lucene/CHANGES.txt

@@ -250,6 +250,8 @@ Bug Fixes
 
 * GITHUB#13031: ScorerSupplier created by QueryProfilerWeight will propagate topLevelScoringClause to the sub ScorerSupplier. (Shintaro Murakami)
 
+* GITHUB#13059: Fixed missing IndicNormalization and DecimalDigit filters in TeluguAnalyzer normalization (Dmitry Cherniachenko)
+
 Build
 ---------------------
 

lucene/analysis/common/src/java/org/apache/lucene/analysis/te/TeluguAnalyzer.java

@@ -127,8 +127,8 @@ public final class TeluguAnalyzer extends StopwordAnalyzerBase {
   @Override
   protected TokenStream normalize(String fieldName, TokenStream in) {
     TokenStream result = new DecimalDigitFilter(in);
-    result = new IndicNormalizationFilter(in);
-    result = new TeluguNormalizationFilter(in);
+    result = new IndicNormalizationFilter(result);
+    result = new TeluguNormalizationFilter(result);
     return result;
   }
 }

lucene/analysis/common/src/test/org/apache/lucene/analysis/te/TestTeluguAnalyzer.java

@@ -19,6 +19,7 @@ package org.apache.lucene.analysis.te;
 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.CharArraySet;
 import org.apache.lucene.tests.analysis.BaseTokenStreamTestCase;
+import org.apache.lucene.util.BytesRef;
 
 public class TestTeluguAnalyzer extends BaseTokenStreamTestCase {
 
@@ -48,6 +49,17 @@ public class TestTeluguAnalyzer extends BaseTokenStreamTestCase {
     a.close();
   }
 
+  public void testNormalization() {
+    TeluguAnalyzer a = new TeluguAnalyzer();
+    // DecimalDigitsFilter
+    assertEquals(new BytesRef("1234"), a.normalize("dummy", "౧౨౩౪"));
+    // IndicNormalizationFilter
+    assertEquals(new BytesRef("ऑऑ"), a.normalize("dummy", "अाॅअाॅ"));
+    // TeluguNormalizationFilter
+    assertEquals(new BytesRef("ఓనమాల"), a.normalize("dummy", "ఒౕనమాల"));
+    a.close();
+  }
+
   /** Send some random strings to the analyzer */
   public void testRandomStrings() throws Exception {
     TeluguAnalyzer analyzer = new TeluguAnalyzer();