HSEARCH-2387 Add dynamic mapping index property

elasticsearch/src/main/java/org/hibernate/search/elasticsearch/cfg/DynamicType.java

@@ -0,0 +1,35 @@
+/*
+ * Hibernate Search, full-text search for your domain model
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.search.elasticsearch.cfg;
+
+/**
+ * Configuration values for Elasticsearch "dynamic" attribute values.
+ * <p>
+ * Defines the behaviour when a document contains an unrecognized field.
+ *
+ * @see <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic.html">Elasticsearch mapping:
+ * dynamic</a>
+ *
+ * @author Davide D'Alto
+ */
+public enum DynamicType {
+
+	/**
+	 * Add unrecognized fields to the schema
+	 */
+	TRUE,
+
+	/**
+	 * Ignore unrecognized field
+	 */
+	FALSE,
+
+	/**
+	 * Throw exception when the field is unrecognized
+	 */
+	STRICT;
+}

elasticsearch/src/main/java/org/hibernate/search/elasticsearch/cfg/ElasticsearchEnvironment.java

@@ -18,6 +18,7 @@ public final class ElasticsearchEnvironment {
 	 */
 	public static final class Defaults {
 
+		public static final DynamicType DYNAMIC_MAPPING = DynamicType.STRICT;
 		public static final String SERVER_URI = "http://localhost:9200";
 		public static final int SERVER_READ_TIMEOUT = 60000;
 		public static final int SERVER_CONNECTION_TIMEOUT = 3000;
@@ -223,6 +224,21 @@ public static final class Defaults {
 	 */
 	public static final String SCROLL_TIMEOUT = "elasticsearch.scroll_timeout";
 
+	/**
+	 * Property for specifying the behaviour when Elasticsearch encounters a previously unknown field in a document.
+	 * <p>
+	 * Possible values are:
+	 * <p>
+	 * <ul>
+	 *   <li>{@code true}: Add new fields dynamically</li>
+	 *   <li>{@code false}: Ignore new fields</li>
+	 *   <li>{@code strict}: Throw an exception if an unknown field is encountered</li>
+	 * </ul>
+	 * <p>
+	 * Defaults to {@code strict}.
+	 */
+	public static final String DYNAMIC_MAPPING = "elasticsearch.dynamic_mapping";
+
 	private ElasticsearchEnvironment() {
 	}
 }