Remove call to getClass from hashCode implementations.

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/DiscountedCumulativeGainAt.java

@@ -225,6 +225,6 @@ public class DiscountedCumulativeGainAt extends RankedListQualityMetric {
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), position, normalize, unknownDocRating);
+        return Objects.hash(position, normalize, unknownDocRating);
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/PrecisionAtN.java

@@ -197,6 +197,6 @@ public class PrecisionAtN extends RankedListQualityMetric {
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), n);
+        return Objects.hash(n);
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/RankEvalSpec.java

@@ -169,6 +169,6 @@ public class RankEvalSpec extends ToXContentToBytes implements Writeable {
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), specId, ratedRequests, metric);
+        return Objects.hash(specId, ratedRequests, metric);
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/RatedDocument.java

@@ -136,6 +136,6 @@ public class RatedDocument extends ToXContentToBytes implements Writeable, FromX
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), key, rating);
+        return Objects.hash(key, rating);
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/RatedDocumentKey.java

@@ -139,6 +139,6 @@ public class RatedDocumentKey extends ToXContentToBytes implements Writeable, Fr
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), index, type, docId);
+        return Objects.hash(index, type, docId);
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/RatedRequest.java

@@ -225,6 +225,6 @@ public class RatedRequest extends ToXContentToBytes implements Writeable {
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), specId, testRequest, indices.hashCode(), types.hashCode(), ratedDocs.hashCode());
+        return Objects.hash(specId, testRequest, indices.hashCode(), types.hashCode(), ratedDocs.hashCode());
     }
 }

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/ReciprocalRank.java

@@ -187,6 +187,6 @@ public class ReciprocalRank extends RankedListQualityMetric {
     
     @Override
     public final int hashCode() {
-        return Objects.hash(getClass(), maxAcceptableRank);
+        return Objects.hash(maxAcceptableRank);
     }
 }