Improve execution of terms queries over wildcard fields

docs/changelog/128826.yaml

@@ -0,0 +1,6 @@
+pr: 128826
+summary: Improve execution of terms queries over wildcard fields
+area: Search
+type: bug
+issues:
+ - 128201

x-pack/plugin/wildcard/build.gradle

@@ -7,6 +7,7 @@
 
 apply plugin: 'elasticsearch.internal-es-plugin'
 apply plugin: 'elasticsearch.internal-yaml-rest-test'
+apply plugin: 'elasticsearch.internal-cluster-test'
 
 esplugin {
   name = 'wildcard'

x-pack/plugin/wildcard/src/internalClusterTest/java/org/elasticsearch/xpack/wildcard/search/WildcardSearchIT.java

@@ -0,0 +1,154 @@
+/*
+ * 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; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.wildcard.search;
+
+import org.elasticsearch.action.bulk.BulkRequestBuilder;
+import org.elasticsearch.action.index.IndexRequest;
+import org.elasticsearch.index.query.TermQueryBuilder;
+import org.elasticsearch.index.query.TermsQueryBuilder;
+import org.elasticsearch.plugins.Plugin;
+import org.elasticsearch.test.ESIntegTestCase;
+import org.elasticsearch.xcontent.XContentBuilder;
+import org.elasticsearch.xcontent.XContentFactory;
+import org.elasticsearch.xcontent.XContentType;
+import org.elasticsearch.xpack.wildcard.Wildcard;
+import org.hamcrest.Matchers;
+import org.junit.Before;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertResponse;
+
+public class WildcardSearchIT extends ESIntegTestCase {
+
+    private List<String> terms = null;
+
+    @Override
+    protected Collection<Class<? extends Plugin>> nodePlugins() {
+        return Collections.singleton(Wildcard.class);
+    }
+
+    @Before
+    public void setup() throws IOException {
+        terms = new ArrayList<>();
+        XContentBuilder xcb = XContentFactory.jsonBuilder()
+            .startObject()
+            .startObject("properties")
+            .startObject("wildcard")
+            .field("type", "wildcard")
+            .endObject()
+            .startObject("keyword")
+            .field("type", "keyword")
+            .endObject()
+            .endObject()
+            .endObject();
+        indicesAdmin().prepareCreate("test").setMapping(xcb).get();
+        final int numDocs = randomIntBetween(100, 1000);
+        final BulkRequestBuilder builder = client().prepareBulk();
+        for (int i = 0; i < numDocs; i++) {
+            if (rarely()) {
+                indexMultiValue(builder);
+            } else {
+                indexSingleValue(builder);
+            }
+        }
+        assertFalse(builder.get().hasFailures());
+        indicesAdmin().prepareRefresh("test").get();
+    }
+
+    private void indexSingleValue(BulkRequestBuilder builder) {
+        String term = randomIndexString();
+        builder.add(
+            new IndexRequest("test").source("{\"wildcard\" : \"" + term + "\", \"keyword\" : \"" + term + "\"}", XContentType.JSON)
+        );
+        terms.add(term);
+    }
+
+    private void indexMultiValue(BulkRequestBuilder builder) {
+        int docSize = randomIntBetween(1, 10);
+        String[] docTerms = new String[docSize];
+        for (int i = 0; i < docSize; i++) {
+            String term = randomIndexString();
+            terms.add(term);
+            docTerms[i] = "\"" + term + "\"";
+        }
+        builder.add(
+            new IndexRequest("test").source(
+                "{\"wildcard\" : " + Arrays.toString(docTerms) + ", \"keyword\" : " + Arrays.toString(docTerms) + "}",
+                XContentType.JSON
+            )
+        );
+    }
+
+    public void testTermQueryDuel() {
+        for (int i = 0; i < 50; i++) {
+            String term = randomQueryString(terms);
+            TermQueryBuilder termQueryBuilder1 = new TermQueryBuilder("wildcard", term);
+            TermQueryBuilder termQueryBuilder2 = new TermQueryBuilder("keyword", term);
+            assertResponse(
+                client().prepareSearch("test").setQuery(termQueryBuilder1),
+                response -> assertResponse(
+                    client().prepareSearch("test").setQuery(termQueryBuilder2),
+                    response2 -> assertThat(
+                        response.getHits().getTotalHits().value(),
+                        Matchers.equalTo(response2.getHits().getTotalHits().value())
+                    )
+                )
+            );
+        }
+    }
+
+    public void testTermsQueryDuel() {
+        for (int i = 0; i < 10; i++) {
+            String[] terms = new String[randomIntBetween(2, 8192)];
+            for (int j = 0; j < terms.length; j++) {
+                terms[j] = randomQueryString(this.terms);
+            }
+            TermsQueryBuilder termsQueryBuilder1 = new TermsQueryBuilder("wildcard", terms);
+            TermsQueryBuilder termsQueryBuilder2 = new TermsQueryBuilder("keyword", terms);
+            assertResponse(
+                client().prepareSearch("test").setQuery(termsQueryBuilder1),
+                response -> assertResponse(
+                    client().prepareSearch("test").setQuery(termsQueryBuilder2),
+                    response2 -> assertThat(
+                        response.getHits().getTotalHits().value(),
+                        Matchers.equalTo(response2.getHits().getTotalHits().value())
+                    )
+                )
+            );
+        }
+    }
+
+    private static String randomIndexString() {
+        String string = randomAlphaOfLength(randomIntBetween(0, 30));
+        if (rarely()) {
+            return string + "*";
+        } else if (rarely()) {
+            return "*" + string;
+        } else if (rarely()) {
+            return "*" + string + "*";
+        } else {
+            return string;
+        }
+    }
+
+    private static String randomQueryString(List<String> terms) {
+        if (rarely()) {
+            return terms.get(randomIntBetween(0, terms.size() - 1));
+        } else if (randomBoolean()) {
+            return randomAlphaOfLength(randomIntBetween(0, 30));
+        } else {
+            return randomAlphaOfLength(1) + "*";
+        }
+    }
+}