update search-service MappingService

search/search-service/src/main/java/cn/reghao/tnb/search/app/es/MappingService.java

@@ -33,7 +33,6 @@ public class MappingService {
         Map<String, Property> propertyMap = new HashMap<>();
         propertyMap.put("id", keywordProp);
         propertyMap.put("timeIso8601", dateProp);
-        propertyMap.put("requestTimestamp", dateProp);
         propertyMap.put("remoteAddr", keywordProp);
         propertyMap.put("request", textKeywordProp);
         propertyMap.put("status", intProp);