Add WRRWeights class

Signed-off-by: pranikum <109206473+pranikum@users.noreply.github.com>

server/src/main/java/org/opensearch/cluster/routing/WRRWeights.java

@@ -0,0 +1,77 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.cluster.routing;
+
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+import org.opensearch.common.io.stream.Writeable;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * Entity for Weighted Round Robin weights
+ *
+ * @opensearch.internal
+ */
+public class WRRWeights implements Writeable {
+    private String attributeName;
+    private Map<String, Object> weights;
+
+    public WRRWeights(String attributeName, Map<String, Object> weights) {
+        this.attributeName = attributeName;
+        this.weights = weights;
+    }
+
+    public WRRWeights(WRRWeights wrrWeight) {
+        this.attributeName = wrrWeight.attributeName();
+        this.weights = wrrWeight.weights;
+    }
+
+    public WRRWeights(StreamInput in) throws IOException {
+        attributeName = in.readString();
+        weights = in.readMap();
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeString(attributeName);
+        out.writeMap(weights);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        WRRWeights that = (WRRWeights) o;
+
+        if (!attributeName.equals(that.attributeName)) return false;
+        return weights.equals(that.weights);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(attributeName, weights);
+    }
+
+    @Override
+    public String toString() {
+        return "WRRWeightsDefinition{" + attributeName + "}{" + weights().toString() + "}";
+    }
+
+    public Map<String, Object> weights() {
+        return this.weights;
+    }
+
+    public String attributeName() {
+        return this.attributeName;
+    }
+}