From 63326ca322ccb8c1bd3662ab7c0bfd38a86a53cb Mon Sep 17 00:00:00 2001
From: gnuhpc <gnuhpc@gmail.com>
Date: Sat, 5 Aug 2017 16:59:06 +0800
Subject: [PATCH] For upgrade compatibility

---
 .../elasticsearch/plugin/analysis/ik/AnalysisIkPlugin.java  | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main/java/org/elasticsearch/plugin/analysis/ik/AnalysisIkPlugin.java b/src/main/java/org/elasticsearch/plugin/analysis/ik/AnalysisIkPlugin.java
index e6ed25c7..1edad2e3 100644
--- a/src/main/java/org/elasticsearch/plugin/analysis/ik/AnalysisIkPlugin.java
+++ b/src/main/java/org/elasticsearch/plugin/analysis/ik/AnalysisIkPlugin.java
@@ -24,6 +24,9 @@ public Map<String, AnalysisModule.AnalysisProvider<TokenizerFactory>> getTokeniz
 
         extra.put("ik_smart", IkTokenizerFactory::getIkSmartTokenizerFactory);
         extra.put("ik_max_word", IkTokenizerFactory::getIkTokenizerFactory);
+        //For compatibility, otherwise mapping parser will fail during upgrade from 2.x to 5.0
+        //   if you have any field using ik as Analyzer/Tokenizer.
+        extra.put("ik", IkTokenizerFactory::getIkSmartTokenizerFactory);
 
         return extra;
     }
@@ -34,6 +37,9 @@ public Map<String, AnalysisModule.AnalysisProvider<AnalyzerProvider<? extends An
 
         extra.put("ik_smart", IkAnalyzerProvider::getIkSmartAnalyzerProvider);
         extra.put("ik_max_word", IkAnalyzerProvider::getIkAnalyzerProvider);
+        //For compatibility, otherwise mapping parser will fail during upgrade from 2.x to 5.0
+        //   if you have any field using ik as Analyzer/Tokenizer.
+        extra.put("ik", IkAnalyzerProvider::getIkSmartAnalyzerProvider);
 
         return extra;
     }