add uppercase token filter

closes #5539

docs/reference/analysis/tokenfilters.asciidoc

@@ -17,6 +17,8 @@ include::tokenfilters/length-tokenfilter.asciidoc[]
 
 include::tokenfilters/lowercase-tokenfilter.asciidoc[]
 
+include::tokenfilters/uppercase-tokenfilter.asciidoc[]
+
 include::tokenfilters/ngram-tokenfilter.asciidoc[]
 
 include::tokenfilters/edgengram-tokenfilter.asciidoc[]

docs/reference/analysis/tokenfilters/uppercase-tokenfilter.asciidoc

@@ -0,0 +1,5 @@
+[[analysis-uppercase-tokenfilter]]
+=== Uppercase Token Filter
+
+A token filter of type `uppercase` that normalizes token text to upper
+case.

src/main/java/org/elasticsearch/index/analysis/AnalysisModule.java

@@ -426,6 +426,7 @@ public class AnalysisModule extends AbstractModule {
             tokenFiltersBindings.processTokenFilter("asciifolding", ASCIIFoldingTokenFilterFactory.class);
             tokenFiltersBindings.processTokenFilter("length", LengthTokenFilterFactory.class);
             tokenFiltersBindings.processTokenFilter("lowercase", LowerCaseTokenFilterFactory.class);
+            tokenFiltersBindings.processTokenFilter("uppercase", UpperCaseTokenFilterFactory.class);
             tokenFiltersBindings.processTokenFilter("porter_stem", PorterStemTokenFilterFactory.class);
             tokenFiltersBindings.processTokenFilter("kstem", KStemTokenFilterFactory.class);
             tokenFiltersBindings.processTokenFilter("standard", StandardTokenFilterFactory.class);

src/main/java/org/elasticsearch/index/analysis/UpperCaseTokenFilterFactory.java

@@ -0,0 +1,46 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.index.analysis;
+
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.core.UpperCaseFilter;
+import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.inject.assistedinject.Assisted;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.index.Index;
+import org.elasticsearch.index.settings.IndexSettings;
+
+/**
+ *
+ */
+public class UpperCaseTokenFilterFactory extends AbstractTokenFilterFactory {
+
+    @Inject
+    public UpperCaseTokenFilterFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
+        super(index, indexSettings, name, settings);
+    }
+
+    @Override
+    public TokenStream create(TokenStream tokenStream) {
+        return new UpperCaseFilter(version, tokenStream);
+    }
+}
+
+

src/main/java/org/elasticsearch/indices/analysis/PreBuiltTokenFilters.java

@@ -26,6 +26,7 @@ import org.apache.lucene.analysis.commongrams.CommonGramsFilter;
 import org.apache.lucene.analysis.core.LowerCaseFilter;
 import org.apache.lucene.analysis.core.StopAnalyzer;
 import org.apache.lucene.analysis.core.StopFilter;
+import org.apache.lucene.analysis.core.UpperCaseFilter;
 import org.apache.lucene.analysis.cz.CzechStemFilter;
 import org.apache.lucene.analysis.de.GermanStemFilter;
 import org.apache.lucene.analysis.en.KStemFilter;
@@ -117,6 +118,13 @@ public enum PreBuiltTokenFilters {
         }
     },
 
+    UPPERCASE(CachingStrategy.LUCENE) {
+        @Override
+        public TokenStream create(TokenStream tokenStream, Version version) {
+            return new UpperCaseFilter(version.luceneVersion, tokenStream);
+        }
+    },
+
     KSTEM(CachingStrategy.ONE) {
         @Override
         public TokenStream create(TokenStream tokenStream, Version version) {