Actually close IndexAnalyzers contents (#43914)

IndexAnalyzers has a close() method that should iterate through all its wrapped
analyzers and close each one in turn. However, instead of delegating to the
analyzers' close() methods, it instead wraps them in a Closeable interface,
which just returns a list of the analyzers. In addition, whitespace normalizers are
ignored entirely.

server/src/main/java/org/elasticsearch/index/analysis/IndexAnalyzers.java

@@ -24,6 +24,7 @@
 import java.io.IOException;
 import java.util.Map;
 import java.util.Objects;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import static java.util.Collections.unmodifiableMap;
@@ -106,8 +107,9 @@ public NamedAnalyzer getDefaultSearchQuoteAnalyzer() {
 
     @Override
     public void close() throws IOException {
-       IOUtils.close(() -> Stream.concat(analyzers.values().stream(), normalizers.values().stream())
-           .filter(a -> a.scope() == AnalyzerScope.INDEX)
-           .iterator());
+        IOUtils.close(Stream.of(analyzers.values().stream(), normalizers.values().stream(), whitespaceNormalizers.values().stream())
+            .flatMap(s -> s)
+            .filter(a -> a.scope() == AnalyzerScope.INDEX)
+            .collect(Collectors.toList()));
     }
 }

server/src/test/java/org/elasticsearch/index/analysis/IndexAnalyzersTests.java

@@ -19,13 +19,16 @@
 
 package org.elasticsearch.index.analysis;
 
+import org.apache.lucene.analysis.core.KeywordAnalyzer;
+import org.apache.lucene.analysis.core.WhitespaceAnalyzer;
 import org.apache.lucene.analysis.standard.StandardAnalyzer;
 import org.elasticsearch.test.ESTestCase;
 
 import java.io.IOException;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
 
 public class IndexAnalyzersTests extends ESTestCase {
 
@@ -77,4 +80,38 @@ public void testAnalyzerDefaults() throws IOException {
         }
     }
 
+    public void testClose() throws IOException {
+
+        AtomicInteger closes = new AtomicInteger(0);
+        NamedAnalyzer a = new NamedAnalyzer("default", AnalyzerScope.INDEX, new WhitespaceAnalyzer()){
+            @Override
+            public void close() {
+                super.close();
+                closes.incrementAndGet();
+            }
+        };
+
+        NamedAnalyzer n = new NamedAnalyzer("keyword_normalizer", AnalyzerScope.INDEX, new KeywordAnalyzer()){
+            @Override
+            public void close() {
+                super.close();
+                closes.incrementAndGet();
+            }
+        };
+
+        NamedAnalyzer w = new NamedAnalyzer("whitespace_normalizer", AnalyzerScope.INDEX, new WhitespaceAnalyzer()){
+            @Override
+            public void close() {
+                super.close();
+                closes.incrementAndGet();
+            }
+        };
+
+        IndexAnalyzers ia = new IndexAnalyzers(Collections.singletonMap("default", a),
+            Collections.singletonMap("n", n), Collections.singletonMap("w", w));
+        ia.close();
+        assertEquals(3, closes.get());
+
+    }
+
 }