diff --git a/backend/src/main/java/com/park/utmstack/service/elasticsearch/SearchUtil.java b/backend/src/main/java/com/park/utmstack/service/elasticsearch/SearchUtil.java
index 4d0a7133d..9157f2f4f 100644
--- a/backend/src/main/java/com/park/utmstack/service/elasticsearch/SearchUtil.java
+++ b/backend/src/main/java/com/park/utmstack/service/elasticsearch/SearchUtil.java
@@ -229,7 +229,7 @@ private static void buildIsInFields(BoolQuery.Builder bool, FilterType filter) {
         final String ctx = CLASSNAME + ".buildIsInFields";
         try {
             filter.validate();
-            String value = CustomStringEscapeUtil.opensearchQueryStringEscape(String.valueOf(filter.getValue()));
+            String value = CustomStringEscapeUtil.openSearchQueryStringEscap(String.valueOf(filter.getValue()));
             bool.filter(f -> f.queryString(q -> q
                 .defaultField("*")
                 .query("*" + value + "*")));
@@ -242,7 +242,7 @@ private static void buildIsNotInFields(BoolQuery.Builder bool, FilterType filter
         final String ctx = CLASSNAME + ".buildIsNotInFields";
         try {
             filter.validate();
-            String value = CustomStringEscapeUtil.opensearchQueryStringEscape(String.valueOf(filter.getValue()));
+            String value = CustomStringEscapeUtil.openSearchQueryStringEscap(String.valueOf(filter.getValue()));
             bool.filter(f -> f.bool(b -> b.mustNot(n -> n.queryString(q -> q
                 .defaultField("*")
                 .query("*" + value + "*")))));
diff --git a/backend/src/main/java/com/park/utmstack/util/CustomStringEscapeUtil.java b/backend/src/main/java/com/park/utmstack/util/CustomStringEscapeUtil.java
index 648bc84a4..308cf036f 100644
--- a/backend/src/main/java/com/park/utmstack/util/CustomStringEscapeUtil.java
+++ b/backend/src/main/java/com/park/utmstack/util/CustomStringEscapeUtil.java
@@ -7,13 +7,19 @@
 import java.util.Map;
 
 public class CustomStringEscapeUtil {
-    public static String opensearchQueryStringEscape(String str) {
-        final String[] chars = new String[] {"+", "-", "=", "&&", "||", "!", "(", ")", "{", "}", "[", "]", "^", "\"", "~", "*", "?", ":", "\\", "/"};
-        final Map<CharSequence, CharSequence> escapeCustomMap = new HashMap<>();
-        escapeCustomMap.put("<", "");
-        escapeCustomMap.put(">", "");
-        for (String s : chars)
-            escapeCustomMap.put(s, "\\\\" + s);
-        return new AggregateTranslator(new LookupTranslator(escapeCustomMap)).translate(str);
+
+    private static final String[] CHARS = new String[] {"+", "-", "=", "&&", "||", "!", "(", ")", "{", "}", "[", "]", "^", "\"", "~", "*", "?", ":", "\\", "/"};
+
+    private static final Map<CharSequence, CharSequence> ESCAPE_CUSTOM_MAP = new HashMap<>();
+
+    static {
+        ESCAPE_CUSTOM_MAP.put("<", "");
+        ESCAPE_CUSTOM_MAP.put(">", "");
+        for (String s : CHARS)
+            ESCAPE_CUSTOM_MAP.put(s, "\\" + s);
+    }
+
+    public static String openSearchQueryStringEscap(String str) {
+        return new AggregateTranslator(new LookupTranslator(ESCAPE_CUSTOM_MAP)).translate(str);
     }
 }