[GitHub] [lucene-solr] vthacker commented on a change in pull request #1620: SOLR-14590 : Add support for Lucene's FeatureField in Solr

[GitBox <gi...@apache.org>]

vthacker commented on a change in pull request #1620:
URL: https://github.com/apache/lucene-solr/pull/1620#discussion_r447410253



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File path: solr/core/src/java/org/apache/solr/schema/RankField.java
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@@ -0,0 +1,140 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.schema;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.apache.lucene.document.FeatureField;
+import org.apache.lucene.index.IndexableField;
+import org.apache.lucene.index.IndexableFieldType;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.SortField;
+import org.apache.lucene.search.TermQuery;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.response.TextResponseWriter;
+import org.apache.solr.search.QParser;
+import org.apache.solr.search.RankQParserPlugin;
+import org.apache.solr.uninverting.UninvertingReader.Type;
+
+/**
+ * <p>
+ * {@code RankField}s can be used to store scoring factors to improve document ranking. They should be used
+ * in combination with {@link RankQParserPlugin}. To use:
+ * </p>
+ * <p>
+ * Define the {@code RankField} {@code fieldType} in your schema:
+ * </p>
+ * <pre class="prettyprint">
+ * &lt;fieldType name="rank" class="solr.RankField" /&gt;
+ * </pre>
+ * <p>
+ * Add fields to the schema, i.e.:
+ * </p>
+ * <pre class="prettyprint">
+ * &lt;field name="rank_1" type="rank" /&gt;

Review comment:
       small nit: something like `document_length_boost` might be a better example to help a user realize how they can leverage this feature?




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