fix 21 syntax

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

core/src/main/java/org/opensearch/sql/expression/function/jsonUDF/JsonExtractFunctionImpl.java

@@ -15,6 +15,8 @@
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
+
 import org.apache.calcite.adapter.enumerable.NotNullImplementor;
 import org.apache.calcite.adapter.enumerable.NullPolicy;
 import org.apache.calcite.adapter.enumerable.RexImpTable;
@@ -64,7 +66,7 @@ public static Object eval(Object... args) {
     String jsonStr = (String) args[0];
     List<Object> jsonPaths = Arrays.asList(args).subList(1, args.length);
     List<String> pathSpecs =
-        jsonPaths.stream().map(Object::toString).map(JsonUtils::convertToJsonPath).toList();
+        jsonPaths.stream().map(Object::toString).map(JsonUtils::convertToJsonPath).collect(Collectors.toList());
     List<Object> results = new ArrayList<>();
     for (String pathSpec : pathSpecs) {
       Object queryResult = a.jsonQuery(jsonStr, pathSpec, WITHOUT_ARRAY, NULL, NULL, false);

core/src/test/java/org/opensearch/sql/expression/json/JsonFunctionsTest.java

@@ -11,6 +11,8 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 import java.util.List;
+import java.util.stream.Collectors;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.junit.jupiter.MockitoExtension;
@@ -61,7 +63,7 @@ void test_convertToJsonPath() {
     List<String> originalJsonPath = List.of("{}", "a.b.c", "a{2}.c", "{3}.bc{}.d{1}");
     List<String> targetJsonPath = List.of("$.[*]", "$.a.b.c", "$.a[2].c", "$.[3].bc[*].d[1]");
     List<String> convertedJsonPath =
-        originalJsonPath.stream().map(JsonUtils::convertToJsonPath).toList();
+        originalJsonPath.stream().map(JsonUtils::convertToJsonPath).collect(Collectors.toList());
     assertEquals(targetJsonPath, convertedJsonPath);
   }