Function: add lowcase enable AND fix bug mentioned in ISSUE#1097

Author: kin122

core/src/main/java/org/wltea/analyzer/cfg/Configuration.java

@@ -38,6 +38,11 @@ public boolean isEnableRemoteDict() {
 	public boolean isEnableLowercase() {
 		return enableLowercase;
 	}
+
+	public Configuration setEnableLowercase(boolean enableLowercase) {
+		this.enableLowercase = enableLowercase;
+		return this;
+	}
 
 	public abstract Path getPath(String first, String... more);
 

core/src/main/java/org/wltea/analyzer/core/AnalyzeContext.java

@@ -223,7 +223,7 @@ boolean needRefillBuffer(){
 	 * 累计当前的segmentBuff相对于reader起始位置的位移
 	 */
 	void markBufferOffset(){
-		this.buffOffset += this.cursor;
+		this.buffOffset += this.cursor + 1;
 	}
 
 	/**

elasticsearch/src/main/java/com/infinilabs/ik/elasticsearch/IkAnalyzerProvider.java

@@ -12,7 +12,10 @@ public class IkAnalyzerProvider extends AbstractIndexAnalyzerProvider<IKAnalyzer
 
     public IkAnalyzerProvider(IndexSettings indexSettings, Environment env, String name, Settings settings, boolean useSmart) {
         super(name);
-        Configuration configuration = new ConfigurationSub(env, settings).setUseSmart(useSmart);
+        // Get the enable_lowercase setting from analyzer settings, default to true
+        boolean enableLowercase = settings.getAsBoolean("enable_lowercase", true);
+
+        Configuration configuration = new ConfigurationSub(env, settings).setUseSmart(useSmart).setEnableLowercase(enableLowercase);
         analyzer = new IKAnalyzer(configuration);
     }
 

opensearch/src/main/java/com/infinilabs/ik/opensearch/IkAnalyzerProvider.java

@@ -12,8 +12,10 @@ public class IkAnalyzerProvider extends AbstractIndexAnalyzerProvider<IKAnalyzer
 
     public IkAnalyzerProvider(IndexSettings indexSettings, Environment env, String name, Settings settings,boolean useSmart) {
         super(indexSettings, name, settings);
+        // Get the enable_lowercase setting from analyzer settings, default to true
+        boolean enableLowercase = settings.getAsBoolean("enable_lowercase", true);
 
-        Configuration configuration = new ConfigurationSub(env,settings).setUseSmart(useSmart);
+        Configuration configuration = new ConfigurationSub(env,settings).setUseSmart(useSmart).setEnableLowercase(enableLowercase);
 
         analyzer=new IKAnalyzer(configuration);
     }