Fixing ChunkingSettingsBuilder test for generating rerank chunking settings

Author: dan-rubinstein

muted-tests.yml

@@ -645,9 +645,6 @@ tests:
 - class: org.elasticsearch.upgrades.FullClusterRestartIT
   method: testSearch {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/135927
-- class: org.elasticsearch.xpack.inference.chunking.ChunkingSettingsBuilderTests
-  method: testBuildChunkingSettingsForElasticReranker_QueryTokenCountLessThanHalfOfTokenLimit
-  issue: https://github.com/elastic/elasticsearch/issues/135928
 - class: org.elasticsearch.upgrades.FullClusterRestartIT
   method: testPeerRecoveryRetentionLeases {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/135929

x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/chunking/ChunkingSettingsBuilderTests.java

@@ -54,7 +54,7 @@ public void testValidChunkingSettingsMap() {
     public void testBuildChunkingSettingsForElasticReranker_QueryTokenCountLessThanHalfOfTokenLimit() {
         // Generate a word count for a non-empty query that takes up less than half the token limit
         int maxQueryTokenCount = (ELASTIC_RERANKER_TOKEN_LIMIT - ELASTIC_RERANKER_EXTRA_TOKEN_COUNT) / 2;
-        int queryWordCount = randomIntBetween(1, (int) (maxQueryTokenCount * WORDS_PER_TOKEN));
+        int queryWordCount = randomIntBetween(1, (int) (maxQueryTokenCount * WORDS_PER_TOKEN) - 1);
         var queryTokenCount = Math.ceil(queryWordCount / WORDS_PER_TOKEN);
         ChunkingSettings chunkingSettings = ChunkingSettingsBuilder.buildChunkingSettingsForElasticRerank(queryWordCount);
         assertTrue(chunkingSettings instanceof SentenceBoundaryChunkingSettings);