Replacing unused variable suppress warning with _ (Part 1/5) (#15102)

---------

Signed-off-by: Ankit Jain <[email protected]>

Author: jainankitk

lucene/core/src/test/org/apache/lucene/index/TestAllFilesDetectTruncation.java

@@ -144,9 +144,7 @@ private void truncateOneFile(Directory dir, String victim) throws IOException {
               // In some rare cases, the codec footer would still appear as correct even though the
               // file has been truncated. We just skip the test is this rare case.
               return;
-            } catch (
-                @SuppressWarnings("unused")
-                CorruptIndexException e) {
+            } catch (CorruptIndexException _) {
               // expected
             }
           }

lucene/core/src/test/org/apache/lucene/index/TestCodecs.java

@@ -459,9 +459,7 @@ public void _run() throws Throwable {
         try {
           termsEnum.seekExact(idx);
           success = true;
-        } catch (
-            @SuppressWarnings("unused")
-            UnsupportedOperationException uoe) {
+        } catch (UnsupportedOperationException _) {
           // ok -- skip it
         }
         if (success) {
@@ -513,9 +511,7 @@ public void _run() throws Throwable {
             termsEnum.seekExact(i);
             assertEquals(field.terms[i].docs.length, termsEnum.docFreq());
             assertTrue(termsEnum.term().bytesEquals(new BytesRef(field.terms[i].text2)));
-          } catch (
-              @SuppressWarnings("unused")
-              UnsupportedOperationException uoe) {
+          } catch (UnsupportedOperationException _) {
           }
         }
 

lucene/core/src/test/org/apache/lucene/index/TestDeletionPolicy.java

@@ -301,9 +301,7 @@ public void testExpirationTimeDeletionPolicy() throws IOException, InterruptedEx
                 + (lastDeleteTime - modTime)
                 + " ms) but did not get deleted ",
             lastDeleteTime - modTime <= leeway);
-      } catch (
-          @SuppressWarnings("unused")
-          IOException e) {
+      } catch (IOException _) {
         // OK
         break;
       }

lucene/core/src/test/org/apache/lucene/index/TestDocValuesIndexing.java

@@ -568,9 +568,7 @@ public void run() {
               try {
                 startingGun.await();
                 w.addDocument(doc);
-              } catch (
-                  @SuppressWarnings("unused")
-                  IllegalArgumentException iae) {
+              } catch (IllegalArgumentException _) {
                 // expected
                 hitExc.set(true);
               } catch (Exception e) {

lucene/core/src/test/org/apache/lucene/index/TestDocumentsWriterPerThreadPool.java

@@ -93,9 +93,7 @@ public void testCloseWhileNewWritersLocked() throws IOException, InterruptedExce
                   latch.countDown();
                   pool.getAndLock();
                   fail();
-                } catch (
-                    @SuppressWarnings("unused")
-                    AlreadyClosedException e) {
+                } catch (AlreadyClosedException _) {
                   // fine
                 }
               });

lucene/core/src/test/org/apache/lucene/index/TestExitableDirectoryReader.java

@@ -75,9 +75,7 @@ public BytesRef next() throws IOException {
         try {
           // Sleep for 100ms before each .next() call.
           Thread.sleep(100);
-        } catch (
-            @SuppressWarnings("unused")
-            InterruptedException e) {
+        } catch (InterruptedException _) {
         }
         return in.next();
       }

lucene/core/src/test/org/apache/lucene/index/TestFieldsReader.java

@@ -219,17 +219,13 @@ public void testExceptions() throws Throwable {
     for (int i = 0; i < 2; i++) {
       try {
         storedFields.document(i);
-      } catch (
-          @SuppressWarnings("unused")
-          IOException ioe) {
+      } catch (IOException _) {
         // expected
         exc = true;
       }
       try {
         storedFields.document(i);
-      } catch (
-          @SuppressWarnings("unused")
-          IOException ioe) {
+      } catch (IOException _) {
         // expected
         exc = true;
       }

lucene/core/src/test/org/apache/lucene/index/TestFilterCodecReader.java

@@ -60,9 +60,7 @@ private void implTestDeclaredMethodsOverridden(Class<?> superClass, Class<?> sub
             "getReturnType() difference",
             superClassMethod.getReturnType(),
             subClassMethod.getReturnType());
-      } catch (
-          @SuppressWarnings("unused")
-          NoSuchMethodException e) {
+      } catch (NoSuchMethodException _) {
         fail(subClass + " needs to override '" + superClassMethod + "'");
       }
     }

lucene/core/src/test/org/apache/lucene/index/TestFilterMergePolicy.java

@@ -27,9 +27,7 @@ public void testMethodsOverridden() {
       if (Modifier.isFinal(m.getModifiers()) || Modifier.isPrivate(m.getModifiers())) continue;
       try {
         FilterMergePolicy.class.getDeclaredMethod(m.getName(), m.getParameterTypes());
-      } catch (
-          @SuppressWarnings("unused")
-          NoSuchMethodException e) {
+      } catch (NoSuchMethodException _) {
         fail("FilterMergePolicy needs to override '" + m + "'");
       }
     }

lucene/core/src/test/org/apache/lucene/index/TestFlex.java

@@ -80,9 +80,7 @@ public void testTermOrd() throws Exception {
     assertTrue(terms.next() != null);
     try {
       assertEquals(0, terms.ord());
-    } catch (
-        @SuppressWarnings("unused")
-        UnsupportedOperationException uoe) {
+    } catch (UnsupportedOperationException _) {
       // ok -- codec is not required to support this op
     }
     r.close();