Fix generating vectors with 0 as single value

x-pack/plugin/inference/qa/test-service-plugin/src/main/java/org/elasticsearch/xpack/inference/mock/TestDenseInferenceServiceExtension.java

@@ -173,7 +173,7 @@ protected ServiceSettings getServiceSettingsFromMap(Map<String, Object> serviceS
         private static double[] generateEmbedding(String input, int dimensions, SimilarityMeasure similarityMeasure) {
             double[] embedding = new double[dimensions];
             for (int j = 0; j < dimensions; j++) {
-                embedding[j] = input.hashCode() + (double) j;
+                embedding[j] = input.hashCode() + 1 + j;
             }
 
             return embedding;