TestTaxonomyFacetValueSource.testRandom fails

### Description

```
org.apache.lucene.facet.taxonomy.TestTaxonomyFacetValueSource > testRandom FAILED
java.lang.AssertionError: expected:<10> but was:<9>
at __randomizedtesting.SeedInfo.seed([66414B5A2A3B48F9:140D6E559B5BFE8A]:0)
at junit@4.13.1/org.junit.Assert.fail(Assert.java:89)
at junit@4.13.1/org.junit.Assert.failNotEquals(Assert.java:835)
at junit@4.13.1/org.junit.Assert.assertEquals(Assert.java:647)
at junit@4.13.1/org.junit.Assert.assertEquals(Assert.java:633)
at org.apache.lucene.facet.FacetTestCase.assertFloatValuesEquals(FacetTestCase.java:256)
at org.apache.lucene.facet.FacetTestCase.assertFloatValuesEquals(FacetTestCase.java:249)
at org.apache.lucene.facet.taxonomy.TestTaxonomyFacetValueSource.checkResults(TestTaxonomyFacetValueSource.java:734)
at org.apache.lucene.facet.taxonomy.TestTaxonomyFacetValueSource.testRandom(TestTaxonomyFacetValueSource.java:634)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:48)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
at junit@4.13.1/org.junit.rules.RunRules.evaluate(RunRules.java:20)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
at org.apache.lucene.test_framework@10.0.0-SNAPSHOT/org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
at junit@4.13.1/org.junit.rules.RunRules.evaluate(RunRules.java:20)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
at randomizedtesting.runner@2.8.1/com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
at java.base/java.lang.Thread.run(Thread.java:1583)
```

### Gradle command to reproduce

```
./gradlew test --tests TestTaxonomyFacetValueSource.testRandom -Dtests.seed=66414B5A2A3B48F9 -Dtests.locale=lo -Dtests.timezone=Africa/Juba -Dtests.asserts=true -Dtests.file.encoding=UTF-8
```

Start with TestTaxonomyFacetValueSource.testRandom and its checkResults call at line 734, then reproduce using the supplied Gradle command and seed. Trace the assertion through FacetTestCase.assertFloatValuesEquals; done means the seeded test no longer reports the expected 10 versus actual 9 failure.

Written by the indexing model from the issue text.