Analysis: Allow to alias analyzers, closes #486.

modules/elasticsearch/src/main/java/org/elasticsearch/index/analysis/AnalysisService.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.index.analysis;
 
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.collect.ImmutableMap;
 import org.elasticsearch.common.component.CloseableComponent;
 import org.elasticsearch.common.inject.Inject;
@@ -86,7 +87,18 @@ public class AnalysisService extends AbstractIndexComponent implements Closeable
 
         Map<String, NamedAnalyzer> analyzers = newHashMap();
         for (AnalyzerProvider analyzerFactory : analyzerProviders.values()) {
-            analyzers.put(analyzerFactory.name(), new NamedAnalyzer(analyzerFactory.name(), analyzerFactory.scope(), analyzerFactory.get()));
+            NamedAnalyzer analyzer = new NamedAnalyzer(analyzerFactory.name(), analyzerFactory.scope(), analyzerFactory.get());
+            analyzers.put(analyzerFactory.name(), analyzer);
+            String strAliases = indexSettings.get("index.analysis.analyzer." + analyzerFactory.name() + ".alias");
+            if (strAliases != null) {
+                for (String alias : Strings.commaDelimitedListToStringArray(strAliases)) {
+                    analyzers.put(alias, analyzer);
+                }
+            }
+            String[] aliases = indexSettings.getAsArray("index.analysis.analyzer." + analyzerFactory.name() + ".alias");
+            for (String alias : aliases) {
+                analyzers.put(alias, analyzer);
+            }
         }
         this.analyzers = ImmutableMap.copyOf(analyzers);
 

modules/elasticsearch/src/test/java/org/elasticsearch/index/analysis/AnalysisModuleTests.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.index.analysis;
 
 import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.analysis.standard.StandardAnalyzer;
 import org.elasticsearch.common.inject.Injector;
 import org.elasticsearch.common.inject.ModulesBuilder;
 import org.elasticsearch.common.lucene.analysis.HTMLStripCharFilter;
@@ -77,5 +78,9 @@ public class AnalysisModuleTests {
 
         html = (HtmlStripCharFilterFactory) custom2.charFilters()[1];
         assertThat(html.readAheadLimit(), equalTo(1024));
+
+        // verify aliases
+        analyzer = analysisService.analyzer("alias1").analyzer();
+        assertThat(analyzer, instanceOf(StandardAnalyzer.class));
     }
 }

modules/elasticsearch/src/test/java/org/elasticsearch/index/analysis/test1.json

@@ -25,10 +25,12 @@
             },
             "analyzer" : {
                 "standard" : {
+                    "alias" : "alias1,alias2",
                     "type" : "standard",
                     "stopwords" : ["test1", "test2", "test3"]
                 },
                 "custom1" : {
+                    "alias" : ["alias4", "alias5"],
                     "tokenizer" : "standard",
                     "filter" : ["stop", "stop2"]
                 },

modules/elasticsearch/src/test/java/org/elasticsearch/index/analysis/test1.yml

@@ -17,9 +17,11 @@ index :
         stopwords : [stop2-1, stop2-2]
     analyzer :
       standard :
+        alias: alias1,alias2
         type : standard
         stopwords : [test1, test2, test3]
       custom1 :
+        alias : [alias4, alias5]
         tokenizer : standard
         filter : [stop, stop2]
       custom2 :