making constructor private to reduce confusion

Author: john-wagster

server/src/main/java/org/elasticsearch/index/codec/vectors/cluster/KMeansIntermediate.java

@@ -17,7 +17,7 @@
 class KMeansIntermediate extends KMeansResult {
     private final IntToIntFunction assignmentOrds;
 
-    KMeansIntermediate(float[][] centroids, int[] assignments, IntToIntFunction assignmentOrds, int[] soarAssignments) {
+    private KMeansIntermediate(float[][] centroids, int[] assignments, IntToIntFunction assignmentOrds, int[] soarAssignments) {
         super(centroids, assignments, soarAssignments);
         assert assignmentOrds != null;
         this.assignmentOrds = assignmentOrds;