replace getBytes usage

Author: idegtiarenko

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/hash/Hash.java

@@ -84,7 +84,9 @@ static BytesRef processConstant(@Fixed(build = true) MessageDigest alg, BytesRef
     }
 
     private static BytesRef hash(MessageDigest alg, BytesRef input) {
-        return new BytesRef(HexFormat.of().formatHex(alg.digest(input.utf8ToString().getBytes())));
+        alg.update(input.bytes, input.offset, input.length);
+        var result = alg.digest();
+        return new BytesRef(HexFormat.of().formatHex(result));
     }
 
     @Override

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/hash/HashTests.java

@@ -17,6 +17,7 @@
 import org.elasticsearch.xpack.esql.expression.function.AbstractScalarFunctionTestCase;
 import org.elasticsearch.xpack.esql.expression.function.TestCaseSupplier;
 
+import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
@@ -56,7 +57,7 @@ private static TestCaseSupplier createTestCase(String alg, DataType algType, Dat
             return new TestCaseSupplier.TestCase(
                 List.of(
                     new TestCaseSupplier.TypedData(new BytesRef(alg), algType, "alg"),
-                    new TestCaseSupplier.TypedData(input, inputType, "input")
+                    new TestCaseSupplier.TypedData(new BytesRef(input), inputType, "input")
                 ),
                 "HashEvaluator[alg=Attribute[channel=0], input=Attribute[channel=1]]",
                 DataType.KEYWORD,
@@ -67,7 +68,7 @@ private static TestCaseSupplier createTestCase(String alg, DataType algType, Dat
 
     private static String hash(String alg, String input) {
         try {
-            return HexFormat.of().formatHex(MessageDigest.getInstance(alg).digest(input.getBytes()));
+            return HexFormat.of().formatHex(MessageDigest.getInstance(alg).digest(input.getBytes(StandardCharsets.UTF_8)));
         } catch (NoSuchAlgorithmException e) {
             throw new IllegalArgumentException("Unknown algorithm: " + alg);
         }