Make Geo Context Mapping Parsing More Strict

Currently, if geo context is represented by something other than
geo_point or an object with lat and lon fields, the parsing of it
as a geo context can result in ignoring the context altogether,
returning confusing errors such as number_format_exception or trying
to parse the number specifying as long-encoded hash code. It would also
fail if the geo_point was stored.

This commit makes the mapping parsing more strict and will fail during
mapping update or index creation if the geo context doesn't point to
a geo_point field.

Supersedes elastic#32683

Closes elastic#32202

docs/reference/migration/migrate_7_0/search.asciidoc

@@ -92,6 +92,9 @@ deprecated in 6.x, has been removed. Context enabled suggestion queries
 without contexts have to visit every suggestion, which degrades the search performance
 considerably.
 
+For geo context the value of the `path` parameter is now validated against the mapping,
+and the context is only accepted if `path` points to a field with `geo_point` type.
+
 ==== Semantics changed for `max_concurrent_shard_requests`
 
 `max_concurrent_shard_requests` used to limit the total number of concurrent shard

server/src/main/java/org/elasticsearch/index/mapper/MapperService.java

@@ -52,6 +52,7 @@
 import org.elasticsearch.index.similarity.SimilarityService;
 import org.elasticsearch.indices.InvalidTypeNameException;
 import org.elasticsearch.indices.mapper.MapperRegistry;
+import org.elasticsearch.search.suggest.completion.context.GeoContextMapping;
 
 import java.io.Closeable;
 import java.io.IOException;
@@ -421,6 +422,8 @@ private synchronized Map<String, DocumentMapper> internalMerge(@Nullable Documen
             MapperMergeValidator.validateFieldReferences(fieldMappers, fieldAliasMappers,
                 fullPathObjectMappers, fieldTypes);
 
+            GeoContextMapping.validateGeoContextPaths(indexSettings.getIndexVersionCreated(), fieldMappers, fieldTypes::get);
+
             if (reason == MergeReason.MAPPING_UPDATE) {
                 // this check will only be performed on the master node when there is
                 // a call to the update mapping API. For all other cases like

server/src/main/java/org/elasticsearch/search/suggest/completion/context/ContextMapping.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.search.suggest.completion.context;
 
 import org.elasticsearch.ElasticsearchParseException;
+import org.elasticsearch.Version;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.ToXContentFragment;
@@ -28,13 +29,16 @@
 import org.elasticsearch.common.xcontent.XContentParser.Token;
 import org.elasticsearch.common.xcontent.json.JsonXContent;
 import org.elasticsearch.index.mapper.CompletionFieldMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
+import org.elasticsearch.index.mapper.MappedFieldType;
 import org.elasticsearch.index.mapper.ParseContext;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 import java.util.Set;
+import java.util.function.Function;
 
 /**
  * A {@link ContextMapping} defines criteria that can be used to
@@ -131,6 +135,31 @@ public final List<InternalQueryContext> parseQueryContext(XContentParser parser)
      */
     protected abstract XContentBuilder toInnerXContent(XContentBuilder builder, Params params) throws IOException;
 
+    /**
+     * Checks if the current context is consistent with the rest of the fields. For example, the GeoContext
+     * should check that the field that it points to has the correct type.
+     */
+    protected void validateReferences(Version indexVersionCreated, Function<String, MappedFieldType> fieldResolver) {
+        // No validation is required by default
+    }
+
+    /**
+     * Verifies that all field paths specified in contexts point to the fields with correct mappings
+     */
+    public static void validateGeoContextPaths(Version indexVersionCreated, List<FieldMapper> fieldMappers,
+                                               Function<String, MappedFieldType> fieldResolver) {
+        for (FieldMapper fieldMapper : fieldMappers) {
+            if (CompletionFieldMapper.CONTENT_TYPE.equals(fieldMapper.typeName())) {
+                CompletionFieldMapper.CompletionFieldType fieldType = ((CompletionFieldMapper) fieldMapper).fieldType();
+                if (fieldType.hasContextMappings()) {
+                    for (ContextMapping context : fieldType.getContextMappings()) {
+                        context.validateReferences(indexVersionCreated, fieldResolver);
+                    }
+                }
+            }
+        }
+    }
+
     @Override
     public final XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.field(FIELD_NAME, name);

server/src/main/java/org/elasticsearch/search/suggest/completion/context/ContextMappings.java

@@ -37,6 +37,7 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
@@ -50,7 +51,7 @@
  * and creates context queries for defined {@link ContextMapping}s
  * for a {@link CompletionFieldMapper}
  */
-public class ContextMappings implements ToXContent {
+public class ContextMappings implements ToXContent, Iterable<ContextMapping<?>> {
 
     private final List<ContextMapping<?>> contextMappings;
     private final Map<String, ContextMapping<?>> contextNameMap;
@@ -97,6 +98,11 @@ public void addField(ParseContext.Document document, String name, String input,
         document.add(new TypedContextField(name, input, weight, contexts, document));
     }
 
+    @Override
+    public Iterator<ContextMapping<?>> iterator() {
+        return contextMappings.iterator();
+    }
+
     /**
      * Field prepends context values with a suggestion
      * Context values are associated with a type, denoted by

server/src/main/java/org/elasticsearch/search/suggest/completion/context/GeoContextMapping.java

@@ -19,12 +19,17 @@
 
 package org.elasticsearch.search.suggest.completion.context;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.lucene.document.LatLonDocValuesField;
+import org.apache.lucene.document.LatLonPoint;
 import org.apache.lucene.document.StringField;
 import org.apache.lucene.index.DocValuesType;
 import org.apache.lucene.index.IndexableField;
 import org.elasticsearch.ElasticsearchParseException;
+import org.elasticsearch.Version;
 import org.elasticsearch.common.geo.GeoPoint;
 import org.elasticsearch.common.geo.GeoUtils;
+import org.elasticsearch.common.logging.DeprecationLogger;
 import org.elasticsearch.common.unit.DistanceUnit;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentParser;
@@ -42,6 +47,7 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import static org.elasticsearch.common.geo.GeoHashUtils.addNeighbors;
@@ -69,6 +75,8 @@ public class GeoContextMapping extends ContextMapping<GeoQueryContext> {
     static final String CONTEXT_PRECISION = "precision";
     static final String CONTEXT_NEIGHBOURS = "neighbours";
 
+    private static final DeprecationLogger DEPRECATION_LOGGER = new DeprecationLogger(LogManager.getLogger(GeoContextMapping.class));
+
     private final int precision;
     private final String fieldName;
 
@@ -205,11 +213,11 @@ public Set<CharSequence> parseContext(Document document) {
                 for (IndexableField field : fields) {
                     if (field instanceof StringField) {
                         spare.resetFromString(field.stringValue());
-                    } else {
-                        // todo return this to .stringValue() once LatLonPoint implements it
+                        geohashes.add(spare.geohash());
+                    }  if (field instanceof LatLonPoint || field instanceof LatLonDocValuesField) {
                         spare.resetFromIndexableField(field);
+                        geohashes.add(spare.geohash());
                     }
-                    geohashes.add(spare.geohash());
                 }
             }
         }
@@ -279,6 +287,32 @@ public List<InternalQueryContext> toInternalQueryContexts(List<GeoQueryContext>
         return internalQueryContextList;
     }
 
+    @Override
+    protected void validateReferences(Version indexVersionCreated, Function<String, MappedFieldType> fieldResolver) {
+        if (fieldName != null) {
+            MappedFieldType mappedFieldType = fieldResolver.apply(fieldName);
+            if (mappedFieldType == null) {
+                if (indexVersionCreated.before(Version.V_7_0_0_alpha1)) {
+                    DEPRECATION_LOGGER.deprecatedAndMaybeLog("geo_context_mapping",
+                        "field [{}] referenced in context [{}] is not defined in the mapping", fieldName, name);
+                } else {
+                    throw new ElasticsearchParseException(
+                        "field [{}] referenced in context [{}] is not defined in the mapping", fieldName, name);
+                }
+            } else if (GeoPointFieldMapper.CONTENT_TYPE.equals(mappedFieldType.typeName()) == false) {
+                if (indexVersionCreated.before(Version.V_7_0_0_alpha1)) {
+                    DEPRECATION_LOGGER.deprecatedAndMaybeLog("geo_context_mapping",
+                        "field [{}] referenced in context [{}] must be mapped to geo_point, found [{}]",
+                        fieldName, name, mappedFieldType.typeName());
+                } else {
+                    throw new ElasticsearchParseException(
+                        "field [{}] referenced in context [{}] must be mapped to geo_point, found [{}]",
+                        fieldName, name, mappedFieldType.typeName());
+                }
+            }
+        }
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

server/src/test/java/org/elasticsearch/search/suggest/ContextCompletionSuggestSearchIT.java

@@ -493,15 +493,24 @@ public void testGeoNeighbours() throws Exception {
     }
 
     public void testGeoField() throws Exception {
-//        Version version = VersionUtils.randomVersionBetween(random(), Version.V_2_0_0, Version.V_5_0_0_alpha5);
-//        Settings settings = Settings.builder().put(IndexMetaData.SETTING_VERSION_CREATED, version).build();
         XContentBuilder mapping = jsonBuilder();
         mapping.startObject();
         mapping.startObject(TYPE);
         mapping.startObject("properties");
+        mapping.startObject("location");
+        mapping.startObject("properties");
         mapping.startObject("pin");
         mapping.field("type", "geo_point");
+        // Enable store and disable indexing sometimes
+        if (randomBoolean()) {
+            mapping.field("store", "true");
+        }
+        if (randomBoolean()) {
+            mapping.field("index", "false");
+        }
+        mapping.endObject(); // pin
         mapping.endObject();
+        mapping.endObject(); // location
         mapping.startObject(FIELD);
         mapping.field("type", "completion");
         mapping.field("analyzer", "simple");
@@ -510,7 +519,7 @@ public void testGeoField() throws Exception {
         mapping.startObject();
         mapping.field("name", "st");
         mapping.field("type", "geo");
-        mapping.field("path", "pin");
+        mapping.field("path", "location.pin");
         mapping.field("precision", 5);
         mapping.endObject();
         mapping.endArray();
@@ -524,7 +533,9 @@ public void testGeoField() throws Exception {
 
         XContentBuilder source1 = jsonBuilder()
                 .startObject()
+                .startObject("location")
                 .latlon("pin", 52.529172, 13.407333)
+                .endObject()
                 .startObject(FIELD)
                 .array("input", "Hotel Amsterdam in Berlin")
                 .endObject()
@@ -533,7 +544,9 @@ public void testGeoField() throws Exception {
 
         XContentBuilder source2 = jsonBuilder()
                 .startObject()
+                .startObject("location")
                 .latlon("pin", 52.363389, 4.888695)
+                .endObject()
                 .startObject(FIELD)
                 .array("input", "Hotel Berlin in Amsterdam")
                 .endObject()
@@ -600,6 +613,7 @@ public void assertSuggestions(String suggestionName, SuggestionBuilder suggestBu
     private void createIndexAndMapping(CompletionMappingBuilder completionMappingBuilder) throws IOException {
         createIndexAndMappingAndSettings(Settings.EMPTY, completionMappingBuilder);
     }
+
     private void createIndexAndMappingAndSettings(Settings settings, CompletionMappingBuilder completionMappingBuilder) throws IOException {
         XContentBuilder mapping = jsonBuilder().startObject()
                 .startObject(TYPE).startObject("properties")

server/src/test/java/org/elasticsearch/search/suggest/completion/GeoContextMappingTests.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.search.suggest.completion;
 
 import org.apache.lucene.index.IndexableField;
+import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
@@ -200,6 +201,70 @@ public void testIndexingWithMultipleContexts() throws Exception {
         assertContextSuggestFields(fields, 3);
     }
 
+    public void testMalformedGeoField() throws Exception {
+        XContentBuilder mapping = jsonBuilder();
+        mapping.startObject();
+        mapping.startObject("type1");
+        mapping.startObject("properties");
+        mapping.startObject("pin");
+        String type = randomFrom("text", "keyword", "long");
+        mapping.field("type", type);
+        mapping.endObject();
+        mapping.startObject("suggestion");
+        mapping.field("type", "completion");
+        mapping.field("analyzer", "simple");
+
+        mapping.startArray("contexts");
+        mapping.startObject();
+        mapping.field("name", "st");
+        mapping.field("type", "geo");
+        mapping.field("path", "pin");
+        mapping.field("precision", 5);
+        mapping.endObject();
+        mapping.endArray();
+
+        mapping.endObject();
+
+        mapping.endObject();
+        mapping.endObject();
+        mapping.endObject();
+
+        ElasticsearchParseException ex = expectThrows(ElasticsearchParseException.class,
+            () ->  createIndex("test", Settings.EMPTY, "type1", mapping));
+
+        assertThat(ex.getMessage(), equalTo("field [pin] referenced in context [st] must be mapped to geo_point, found [" + type + "]"));
+    }
+
+    public void testMissingGeoField() throws Exception {
+        XContentBuilder mapping = jsonBuilder();
+        mapping.startObject();
+        mapping.startObject("type1");
+        mapping.startObject("properties");
+        mapping.startObject("suggestion");
+        mapping.field("type", "completion");
+        mapping.field("analyzer", "simple");
+
+        mapping.startArray("contexts");
+        mapping.startObject();
+        mapping.field("name", "st");
+        mapping.field("type", "geo");
+        mapping.field("path", "pin");
+        mapping.field("precision", 5);
+        mapping.endObject();
+        mapping.endArray();
+
+        mapping.endObject();
+
+        mapping.endObject();
+        mapping.endObject();
+        mapping.endObject();
+
+        ElasticsearchParseException ex = expectThrows(ElasticsearchParseException.class,
+            () ->  createIndex("test", Settings.EMPTY, "type1", mapping));
+
+        assertThat(ex.getMessage(), equalTo("field [pin] referenced in context [st] is not defined in the mapping"));
+    }
+
     public void testParsingQueryContextBasic() throws Exception {
         XContentBuilder builder = jsonBuilder().value("ezs42e44yx96");
         XContentParser parser = createParser(JsonXContent.jsonXContent, BytesReference.bytes(builder));