Move the policy class to xpack core module. (#41311)

This allows the transport client use this class in enrich APIs.

Relates to #40997

Author: martijnvg

x-pack/plugin/enrich/src/main/java/org/elasticsearch/xpack/enrich/EnrichPolicy.java renamed to x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/enrich/EnrichPolicy.java

@@ -3,7 +3,7 @@
  * or more contributor license agreements. Licensed under the Elastic License;
  * you may not use this file except in compliance with the Elastic License.
  */
-package org.elasticsearch.xpack.enrich;
+package org.elasticsearch.xpack.core.enrich;
 
 import org.elasticsearch.common.ParseField;
 import org.elasticsearch.common.Strings;
@@ -15,6 +15,7 @@
 import org.elasticsearch.common.xcontent.ToXContentFragment;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.common.xcontent.XContentType;
 
 import java.io.IOException;
@@ -28,7 +29,7 @@
 public final class EnrichPolicy implements Writeable, ToXContentFragment {
 
     static final String EXACT_MATCH_TYPE = "exact_match";
-    static final String[] SUPPORTED_POLICY_TYPES = new String[]{EXACT_MATCH_TYPE};
+    public static final String[] SUPPORTED_POLICY_TYPES = new String[]{EXACT_MATCH_TYPE};
 
     static final ParseField TYPE = new ParseField("type");
     static final ParseField QUERY = new ParseField("query");
@@ -64,6 +65,10 @@ public final class EnrichPolicy implements Writeable, ToXContentFragment {
         PARSER.declareString(ConstructingObjectParser.constructorArg(), SCHEDULE);
     }
 
+    public static EnrichPolicy fromXContent(XContentParser parser) throws IOException {
+        return PARSER.parse(parser, null);
+    }
+
     private final String type;
     private final QuerySource query;
     private final String indexPattern;

x-pack/plugin/enrich/src/main/java/org/elasticsearch/xpack/enrich/EnrichMetadata.java

@@ -16,6 +16,7 @@
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.xpack.core.XPackPlugin;
+import org.elasticsearch.xpack.core.enrich.EnrichPolicy;
 
 import java.io.IOException;
 import java.util.Collections;
@@ -47,7 +48,7 @@ public final class EnrichMetadata extends AbstractNamedDiffable<MetaData.Custom>
                 if (token == XContentParser.Token.FIELD_NAME) {
                     fieldName = p.currentName();
                 } else if (token == XContentParser.Token.START_OBJECT) {
-                    patterns.put(fieldName, EnrichPolicy.PARSER.parse(p, c));
+                    patterns.put(fieldName, EnrichPolicy.fromXContent(p));
                 } else {
                     throw new ElasticsearchParseException("unexpected token [" + token + "]");
                 }

x-pack/plugin/enrich/src/main/java/org/elasticsearch/xpack/enrich/EnrichStore.java

@@ -9,6 +9,7 @@
 import org.elasticsearch.cluster.ClusterStateUpdateTask;
 import org.elasticsearch.cluster.metadata.MetaData;
 import org.elasticsearch.cluster.service.ClusterService;
+import org.elasticsearch.xpack.core.enrich.EnrichPolicy;
 
 import java.util.HashMap;
 import java.util.Map;

x-pack/plugin/enrich/src/test/java/org/elasticsearch/xpack/enrich/EnrichMetadataTests.java

@@ -9,6 +9,7 @@
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.common.xcontent.XContentType;
 import org.elasticsearch.test.AbstractSerializingTestCase;
+import org.elasticsearch.xpack.core.enrich.EnrichPolicy;
 
 import java.io.IOException;
 import java.util.HashMap;

x-pack/plugin/enrich/src/test/java/org/elasticsearch/xpack/enrich/EnrichPolicyTests.java

@@ -16,6 +16,7 @@
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.TermQueryBuilder;
 import org.elasticsearch.test.AbstractSerializingTestCase;
+import org.elasticsearch.xpack.core.enrich.EnrichPolicy;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -29,7 +30,7 @@ public class EnrichPolicyTests extends AbstractSerializingTestCase<EnrichPolicy>
 
     @Override
     protected EnrichPolicy doParseInstance(XContentParser parser) throws IOException {
-        return EnrichPolicy.PARSER.parse(parser, null);
+        return EnrichPolicy.fromXContent(parser);
     }
 
     @Override

x-pack/plugin/enrich/src/test/java/org/elasticsearch/xpack/enrich/EnrichStoreTests.java

@@ -8,6 +8,7 @@
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.xcontent.XContentType;
 import org.elasticsearch.test.ESSingleNodeTestCase;
+import org.elasticsearch.xpack.core.enrich.EnrichPolicy;
 
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicReference;