### CI Link

- https://gradle-enterprise.elastic.co/s/tl3jqzmzqyktq (PR branch)
- https://gradle-enterprise.elastic.co/s/6ao6q7f42tsly (main)

### Repro line

./gradlew ':server:test' --tests "org.elasticsearch.index.mapper.vectors.DenseVectorFieldMapperTests.testVectorSimilarity" -Dtests.seed=39343A357A78EC3 -Dtests.locale=zh-CN -Dtests.timezone=Africa/Maseru -Druntime.java=21

### Does it reproduce?

Yes

### Applicable branches

main

### Failure history

_No response_

### Failure excerpt

  2> java.lang.AssertionError: expected:<COSINE> but was:<DOT_PRODUCT>
        at __randomizedtesting.SeedInfo.seed([39343A357A78EC3:75EC84B47EC59CF]: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.index.mapper.vectors.DenseVectorFieldMapperTests.testVectorSimilarity(DenseVectorFieldMapperTests.java:776)
server/src/test/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapperTests.java
}
                }
                yield floats;
            }
        };
    }
    public void testCannotBeUsedInMultifields() {
        Exception e = expectThrows(MapperParsingException.class, () -> createMapperService(fieldMapping(b -> {
            b.field("type", "keyword");
            b.startObject("fields");
            b.startObject("vectors");
            minimalMapping(b);
            b.endObject();
            b.endObject();
        })));
        assertThat(e.getMessage(), containsString("Field [vectors] of type [dense_vector] can't be used in multifields"));
    }
    public void testByteVectorIndexBoundaries() throws IOException {
        DocumentMapper mapper = createDocumentMapper(
            fieldMapping(
                b -> b.field("type", "dense_vector")
                    .field("element_type", "byte")
                    .field("dims", 3)
                    .field("index", true)
                    .field("similarity", VectorSimilarity.COSINE)
            )
        );
        Exception e = expectThrows(
            DocumentParsingException.class,
            () -> mapper.parse(source(b -> b.array("field", new float[] { 128, 0, 0 })))