Update bbq test data to better distinguish docs (elastic#125705)

Adjust the test data. I verified that the scores are now more
distinguishable when:

 - each doc has its own segment
 - when 1 & 2 are in the same segment but 3 is alone
 - 2 & 3 in the same segment but 1 alone
 - 1 & 3 in the same segment but 2 alone
 - all three in the same segment

closes: elastic#123727 closes:
elastic#124848
(cherry picked from commit d84eb1f)

Author: benwtrent

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/41_knn_search_bbq_hnsw.yml

@@ -68,7 +68,7 @@ setup:
                    -0.279,  0.402, -0.107,  0.308, -0.273,  0.019,  0.082,  0.399,
                    -0.658, -0.03 ,  0.276,  0.041,  0.187, -0.331,  0.165,  0.017,
                    0.171, -0.203, -0.198,  0.115, -0.007,  0.337, -0.444,  0.615,
-                   -0.657,  1.285,  0.2  , -0.062,  0.038,  0.089, -0.068, -0.058]
+                   -0.683,  1.331,  0.194, -0.157, -0.1  , -0.279, -0.098, -0.176]
   # Flush in order to provoke a merge later
   - do:
       indices.flush: