Remove code duplicate from other PR

Author: JonasKunz

libs/exponential-histogram/src/main/java/org/elasticsearch/exponentialhistogram/ExponentialHistogram.java

@@ -202,53 +202,6 @@ static int hashCode(ExponentialHistogram histogram) {
         return hash;
     }
 
-    /**
-     * Default toString implementation for exponential histograms.
-     * @param histogram the histogram to convert to string
-     * @return a string representation of the histogram
-     */
-    static String toString(ExponentialHistogram histogram) {
-        StringBuilder sb = new StringBuilder("ExponentialHistogram{");
-        sb.append("scale=").append(histogram.scale());
-        sb.append(", sum=").append(histogram.sum());
-        sb.append(", valueCount=").append(histogram.valueCount());
-        sb.append(", min=").append(histogram.min());
-        ZeroBucket zb = histogram.zeroBucket();
-        if (zb.zeroThreshold() != 0) {
-            sb.append(", zeroThreshold=").append(zb.zeroThreshold());
-        }
-        if (zb.count() != 0) {
-            sb.append(", zeroCount=").append(zb.count());
-        }
-        BucketIterator neg = histogram.negativeBuckets().iterator();
-        if (neg.hasNext()) {
-            sb.append(", negative=[");
-            appendsBucketsAsString(sb, neg);
-            sb.append("]");
-        }
-        BucketIterator pos = histogram.positiveBuckets().iterator();
-        if (pos.hasNext()) {
-            sb.append(", positive=[");
-            appendsBucketsAsString(sb, pos);
-            sb.append("]");
-        }
-        sb.append("}");
-        return sb.toString();
-    }
-
-    private static void appendsBucketsAsString(StringBuilder out, BucketIterator it) {
-        boolean first = true;
-        while (it.hasNext()) {
-            if (first) {
-                first = false;
-            } else {
-                out.append(", ");
-            }
-            out.append(it.peekIndex()).append(": ").append(it.peekCount());
-            it.advance();
-        }
-    }
-
     static ExponentialHistogram empty() {
         return EmptyExponentialHistogram.INSTANCE;
     }