Mappings: Bring back numeric_resolution.

We had an undocumented parameter called `numeric_resolution` which allows to
configure how to deal with dates when provided as a number. The default is to
handle them as milliseconds, but you can also opt-on for eg. seconds.

Close #10072

docs/reference/mapping/types/core-types.asciidoc

@@ -378,6 +378,9 @@ defaults to `true` or to the parent `object` type setting.
 
 |`ignore_malformed` |Ignored a malformed number. Defaults to `false`.
 
+|`numeric_resolution` |The unit to use when passed in a numeric values. Possible
+values include `seconds` and  `milliseconds` (default).
+
 |=======================================================================
 
 [float]

src/main/java/org/elasticsearch/index/mapper/core/DateFieldMapper.java

@@ -488,13 +488,14 @@ public class DateFieldMapper extends NumberFieldMapper<Long> {
         }
 
         if (value != null) {
+            final long timestamp = timeUnit.toMillis(value);
             if (fieldType.indexOptions() != IndexOptions.NONE || fieldType.stored()) {
-                CustomLongNumericField field = new CustomLongNumericField(this, value, fieldType);
+                CustomLongNumericField field = new CustomLongNumericField(this, timestamp, fieldType);
                 field.setBoost(boost);
                 fields.add(field);
             }
             if (hasDocValues()) {
-                addDocValue(context, fields, value);
+                addDocValue(context, fields, timestamp);
             }
         }
     }
@@ -553,8 +554,7 @@ public class DateFieldMapper extends NumberFieldMapper<Long> {
             return dateTimeFormatter.parser().parseMillis(value);
         } catch (RuntimeException e) {
             try {
-                long time = Long.parseLong(value);
-                return timeUnit.toMillis(time);
+                return Long.parseLong(value);
             } catch (NumberFormatException e1) {
                 throw new MapperParsingException("failed to parse date field [" + value + "], tried both date format [" + dateTimeFormatter.format() + "], and timestamp number with locale [" + dateTimeFormatter.locale() + "]", e);
             }

src/test/java/org/elasticsearch/index/mapper/date/SimpleDateMappingTests.java

@@ -22,6 +22,7 @@ package org.elasticsearch.index.mapper.date;
 import org.apache.lucene.analysis.NumericTokenStream.NumericTermAttribute;
 import org.apache.lucene.analysis.TokenStream;
 import org.apache.lucene.index.DocValuesType;
+import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.search.Filter;
 import org.apache.lucene.search.NumericRangeFilter;
 import org.elasticsearch.ElasticsearchIllegalArgumentException;
@@ -38,10 +39,12 @@ import org.elasticsearch.index.mapper.DocumentMapperParser;
 import org.elasticsearch.index.mapper.FieldMapper;
 import org.elasticsearch.index.mapper.MapperParsingException;
 import org.elasticsearch.index.mapper.ParseContext;
+import org.elasticsearch.index.mapper.ParseContext.Document;
 import org.elasticsearch.index.mapper.ParsedDocument;
 import org.elasticsearch.index.mapper.core.DateFieldMapper;
 import org.elasticsearch.index.mapper.core.LongFieldMapper;
 import org.elasticsearch.index.mapper.core.StringFieldMapper;
+import org.elasticsearch.search.aggregations.support.ValuesSource.Numeric;
 import org.elasticsearch.search.internal.SearchContext;
 import org.elasticsearch.test.ElasticsearchSingleNodeTest;
 import org.elasticsearch.test.TestSearchContext;
@@ -55,8 +58,8 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
-import static org.elasticsearch.index.mapper.string.SimpleStringMappingTests.docValuesType;
 import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilder;
+import static org.elasticsearch.index.mapper.string.SimpleStringMappingTests.docValuesType;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasKey;
 import static org.hamcrest.Matchers.instanceOf;
@@ -396,4 +399,37 @@ public class SimpleDateMappingTests extends ElasticsearchSingleNodeTest {
         assertThat(dateFieldMapperMap.get("field"), is(instanceOf(Map.class)));
         return (Map<String, String>) dateFieldMapperMap.get("field");
     }
+
+    private static long getDateAsMillis(Document doc, String field) {
+        for (IndexableField f : doc.getFields(field)) {
+            if (f.numericValue() != null) {
+                return f.numericValue().longValue();
+            }
+        }
+        throw new AssertionError("missing");
+    }
+
+    public void testNumericResolution() throws Exception {
+        String mapping = XContentFactory.jsonBuilder().startObject().startObject("type")
+                .startObject("properties").startObject("date_field").field("type", "date").field("format", "date_time").field("numeric_resolution", "seconds").endObject().endObject()
+                .endObject().endObject().string();
+
+        DocumentMapper defaultMapper = mapper(mapping);
+
+        // provided as an int
+        ParsedDocument doc = defaultMapper.parse("type", "1", XContentFactory.jsonBuilder()
+                .startObject()
+                .field("date_field", 42)
+                .endObject()
+                .bytes());
+        assertThat(getDateAsMillis(doc.rootDoc(), "date_field"), equalTo(42000L));
+
+        // provided as a string
+        doc = defaultMapper.parse("type", "2", XContentFactory.jsonBuilder()
+                .startObject()
+                .field("date_field", "43")
+                .endObject()
+                .bytes());
+        assertThat(getDateAsMillis(doc.rootDoc(), "date_field"), equalTo(43000L));
+    }
 }