Add H3 Benchmarks (elastic#111359)

Microbenchmarks for H3

benchmarks/build.gradle

@@ -37,6 +37,7 @@ dependencies {
     // us to invoke the JMH uberjar as usual.
     exclude group: 'net.sf.jopt-simple', module: 'jopt-simple'
   }
+  api(project(':libs:elasticsearch-h3'))
   api(project(':modules:aggregations'))
   api(project(':x-pack:plugin:esql-core'))
   api(project(':x-pack:plugin:esql'))

benchmarks/src/main/java/org/elasticsearch/benchmark/h3/H3Benchmark.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+package org.elasticsearch.benchmark.h3;
+
+import org.elasticsearch.h3.H3;
+import org.openjdk.jmh.Main;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.concurrent.TimeUnit;
+
+@OutputTimeUnit(TimeUnit.SECONDS)
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 25, time = 1, timeUnit = TimeUnit.SECONDS)
+@Fork(1)
+public class H3Benchmark {
+
+    @Benchmark
+    public void pointToH3(H3State state, Blackhole bh) {
+        for (int i = 0; i < state.points.length; i++) {
+            for (int res = 0; res <= 15; res++) {
+                bh.consume(H3.geoToH3(state.points[i][0], state.points[i][1], res));
+            }
+        }
+    }
+
+    @Benchmark
+    public void h3Boundary(H3State state, Blackhole bh) {
+        for (int i = 0; i < state.h3.length; i++) {
+            bh.consume(H3.h3ToGeoBoundary(state.h3[i]));
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        Main.main(args);
+    }
+}

benchmarks/src/main/java/org/elasticsearch/benchmark/h3/H3State.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+package org.elasticsearch.benchmark.h3;
+
+import org.elasticsearch.h3.H3;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+
+import java.io.IOException;
+import java.util.Random;
+
+@State(Scope.Benchmark)
+public class H3State {
+
+    double[][] points = new double[1000][2];
+    long[] h3 = new long[1000];
+
+    @Setup(Level.Trial)
+    public void setupTrial() throws IOException {
+        Random random = new Random(1234);
+        for (int i = 0; i < points.length; i++) {
+            points[i][0] = random.nextDouble() * 180 - 90;   // lat
+            points[i][1] = random.nextDouble() * 360 - 180;  // lon
+            int res = random.nextInt(16);            // resolution
+            h3[i] = H3.geoToH3(points[i][0], points[i][1], res);
+        }
+    }
+}