Make Tuple a record (#88280)

Tuple is used extensively across the ES codebase and can be effectively represent as a Java record.

libs/core/src/main/java/org/elasticsearch/core/Tuple.java

@@ -8,50 +8,9 @@
 
 package org.elasticsearch.core;
 
-public class Tuple<V1, V2> {
+public record Tuple<V1, V2> (V1 v1, V2 v2) {
 
     public static <V1, V2> Tuple<V1, V2> tuple(V1 v1, V2 v2) {
         return new Tuple<>(v1, v2);
     }
-
-    private final V1 v1;
-    private final V2 v2;
-
-    public Tuple(V1 v1, V2 v2) {
-        this.v1 = v1;
-        this.v2 = v2;
-    }
-
-    public V1 v1() {
-        return v1;
-    }
-
-    public V2 v2() {
-        return v2;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        Tuple<?, ?> tuple = (Tuple<?, ?>) o;
-
-        if (v1 != null ? v1.equals(tuple.v1) == false : tuple.v1 != null) return false;
-        if (v2 != null ? v2.equals(tuple.v2) == false : tuple.v2 != null) return false;
-
-        return true;
-    }
-
-    @Override
-    public int hashCode() {
-        int result = v1 != null ? v1.hashCode() : 0;
-        result = 31 * result + (v2 != null ? v2.hashCode() : 0);
-        return result;
-    }
-
-    @Override
-    public String toString() {
-        return "Tuple [v1=" + v1 + ", v2=" + v2 + "]";
-    }
 }

libs/core/src/test/java/org/elasticsearch/common/collect/TupleTests.java

@@ -32,6 +32,6 @@ public class TupleTests extends ESTestCase {
         assertNotEquals(t3, t4);
         assertNotEquals(t1, t5);
 
-        assertThat(t1.toString(), equalTo("Tuple [v1=2, v2=foo]"));
+        assertThat(t1.toString(), equalTo("Tuple[v1=2, v2=foo]"));
     }
 }

libs/x-content/src/main/java/org/elasticsearch/xcontent/MediaType.java

@@ -8,8 +8,6 @@
 
 package org.elasticsearch.xcontent;
 
-import org.elasticsearch.core.Tuple;
-
 import java.util.Collections;
 import java.util.Map;
 import java.util.Set;
@@ -40,10 +38,7 @@ public interface MediaType {
      * Parameters for validation is a map where a key is a parameter name, value is a parameter regex which is used for validation.
      * Regex will be applied with case insensitivity.
      */
-    class HeaderValue extends Tuple<String, Map<String, String>> {
-        public HeaderValue(String headerValue, Map<String, String> parametersForValidation) {
-            super(headerValue, parametersForValidation);
-        }
+    record HeaderValue(String v1, Map<String, String> v2) {
 
         public HeaderValue(String headerValue) {
             this(headerValue, Collections.emptyMap());

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/optimizer/Optimizer.java

@@ -6,7 +6,6 @@
  */
 package org.elasticsearch.xpack.sql.optimizer;
 
-import org.elasticsearch.core.Tuple;
 import org.elasticsearch.search.aggregations.metrics.PercentilesConfig;
 import org.elasticsearch.xpack.ql.expression.Alias;
 import org.elasticsearch.xpack.ql.expression.Attribute;
@@ -1060,21 +1059,13 @@ public class Optimizer extends RuleExecutor<LogicalPlan> {
         }
     }
 
-    private static class PercentileKey extends Tuple<Expression, PercentilesConfig> {
+    private record PercentileKey(Expression field, PercentilesConfig percentilesConfig) {
         PercentileKey(Percentile per) {
-            super(per.field(), per.percentilesConfig());
+            this(per.field(), per.percentilesConfig());
         }
 
         PercentileKey(PercentileRank per) {
-            super(per.field(), per.percentilesConfig());
-        }
-
-        private Expression field() {
-            return v1();
-        }
-
-        private PercentilesConfig percentilesConfig() {
-            return v2();
+            this(per.field(), per.percentilesConfig());
         }
     }