Release 5.6.7

Author: Hiroshi Matsuda

pom.xml

@@ -12,7 +12,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<java.version>1.8</java.version>
-		<elasticsearch.version>5.6.6</elasticsearch.version>
+		<elasticsearch.version>5.6.7</elasticsearch.version>
         <lucene.version>6.6.3</lucene.version>
 		<sudachi.version>0.1.1-SNAPSHOT</sudachi.version>
 		<jacoco.skip>true</jacoco.skip>