Escape special ES character when used in pattern matching

Author: gruuya

pg_es_fdw/_es_query.py

@@ -35,10 +35,14 @@ def _pg_es_pattern_map(matchobj):
             return "%"
         elif matchobj.group(0) == "\_":
             return "_"
+        elif matchobj.group(0) == "*":
+            return "\\*"
+        elif matchobj.group(0) == "?":
+            return "\\?"
         elif matchobj.group(0) == "\\\\":
             return "\\"
 
-    return re.sub(r'\\\\|\\?%|\\?_', _pg_es_pattern_map, fr"{expr}")
+    return re.sub(r'\\\\|\\?%|\\?_|\*|\?', _pg_es_pattern_map, fr"{expr}")
 
 
 def _base_qual_to_es(col, op, value, column_map=None):