**Build scan:**
https://gradle-enterprise.elastic.co/s/kwimp3csgmqua/tests/:server:test/org.elasticsearch.search.vectors.KnnByteVectorQueryBuilderTests/testBWCVersionSerializationSimilarity

**Reproduction line:**
```
./gradlew ':server:test' --tests "org.elasticsearch.search.vectors.KnnByteVectorQueryBuilderTests.testBWCVersionSerializationSimilarity" -Dtests.seed=9F413DE37F83E810 -Dtests.locale=pt -Dtests.timezone=Canada/Atlantic -Druntime.java=20
```

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.search.vectors.KnnByteVectorQueryBuilderTests&tests.test=testBWCVersionSerializationSimilarity

**Failure excerpt:**
```
java.lang.AssertionError: expected:<{
  "knn" : {
    "field" : "vector",
    "vector" : "jVPQ",
    "num_candidates" : 699,
    "filters" : [
      {
        "term" : {
          "mapped_string" : {
            "value" : "vBGwQbdddW"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "VXjIrqhhBW"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "LqAmlHSczX"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "xGdhdVrkUB"
          }
        }
      }
    ]
  }
}> but was:<{
  "knn" : {
    "field" : "vector",
    "vector" : "jVPQ",
    "num_candidates" : 699,
    "similarity" : 0.43040353,
    "filters" : [
      {
        "term" : {
          "mapped_string" : {
            "value" : "vBGwQbdddW"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "VXjIrqhhBW"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "LqAmlHSczX"
          }
        }
      },
      {
        "term" : {
          "mapped_string_2" : {
            "value" : "xGdhdVrkUB"
          }
        }
      }
    ]
  }
}>

  at __randomizedtesting.SeedInfo.seed([9F413DE37F83E810:7D499389DE61DA8A]:0)
  at org.junit.Assert.fail(Assert.java:88)
  at org.junit.Assert.failNotEquals(Assert.java:834)
  at org.junit.Assert.assertEquals(Assert.java:118)
  at org.junit.Assert.assertEquals(Assert.java:144)
  at org.elasticsearch.search.vectors.AbstractKnnVectorQueryBuilderTestCase.assertBWCSerialization(AbstractKnnVectorQueryBuilderTestCase.java:268)
  at org.elasticsearch.search.vectors.AbstractKnnVectorQueryBuilderTestCase.testBWCVersionSerializationSimilarity(AbstractKnnVectorQueryBuilderTestCase.java:234)
  at org.elasticsearch.search.vectors.KnnByteVectorQueryBuilderTests.testBWCVersionSerializationSimilarity(KnnByteVectorQueryBuilderTests.java:13)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
  at java.lang.reflect.Method.invoke(Method.java:578)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:48)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
  at java.lang.Thread.run(Thread.java:1623)

```
server/src/test/java/org/elasticsearch/search/vectors/AbstractKnnVectorQueryBuilderTestCase.java
new float[] { 1.0f, 1.0f, 1.0f },
            10,
            null
        );
        IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> query.doToQuery(context));
        assertThat(e.getMessage(), containsString("[knn] queries are only supported on [dense_vector] fields"));
    }
    @Override
    public void testValidOutput() {
        KnnVectorQueryBuilder query = new KnnVectorQueryBuilder(VECTOR_FIELD, new float[] { 1.0f, 2.0f, 3.0f }, 10, null);
        String expected = """
            {
              "knn" : {
                "field" : "vector",
                "vector" : [
                  1.0,
                  2.0,
                  3.0
                ],
                "num_candidates" : 10
              }
            }""";
        assertEquals(expected, query.toString());
    }
    @Override
    public void testMustRewrite() throws IOException {
        SearchExecutionContext context = createSearchExecutionContext();
        context.setAllowUnmappedFields(true);
        TermQueryBuilder termQuery = new TermQueryBuilder("unmapped_field", 42);
        KnnVectorQueryBuilder query = new KnnVectorQueryBuilder(VECTOR_FIELD, new float[] { 1.0f, 2.0f, 3.0f }, VECTOR_DIMENSION, null);