Remove unused member MappedFieldType#indexAnalyzer.

Author: jtibshirani

server/src/main/java/org/elasticsearch/index/mapper/MappedFieldType.java

@@ -72,7 +72,6 @@ public abstract class MappedFieldType {
     private final boolean isStored;
     private final TextSearchInfo textSearchInfo;
     private final Map<String, String> meta;
-    private NamedAnalyzer indexAnalyzer;
     private boolean eagerGlobalOrdinals;
 
     public MappedFieldType(String name, boolean isIndexed, boolean isStored,