[Rollup] Histo group config should support scaled_floats

Metric config already whitelist scaled_floats, but it wasn't added to
the histo group config.  This centralizes the mapping types map
so that both metrics and histo (and any future configs) use the same
map.

Fixes elastic#32035

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/rollup/RollupField.java

@@ -6,6 +6,7 @@
 package org.elasticsearch.xpack.core.rollup;
 
 import org.elasticsearch.common.ParseField;
+import org.elasticsearch.index.mapper.NumberFieldMapper;
 import org.elasticsearch.search.aggregations.metrics.avg.AvgAggregationBuilder;
 import org.elasticsearch.search.aggregations.metrics.max.MaxAggregationBuilder;
 import org.elasticsearch.search.aggregations.metrics.min.MinAggregationBuilder;
@@ -15,6 +16,8 @@
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class RollupField {
     // Fields that are used both in core Rollup actions and Rollup plugin
@@ -34,6 +37,16 @@ public class RollupField {
     public static final List<String> SUPPORTED_METRICS = Arrays.asList(MaxAggregationBuilder.NAME, MinAggregationBuilder.NAME,
             SumAggregationBuilder.NAME, AvgAggregationBuilder.NAME, ValueCountAggregationBuilder.NAME);
 
+    // these mapper types are used by the configs (metric, histo, etc) to validate field mappings
+    public static final List<String> NUMERIC_FIELD_MAPPER_TYPES;
+    static {
+        List<String> types = Stream.of(NumberFieldMapper.NumberType.values())
+            .map(NumberFieldMapper.NumberType::typeName)
+            .collect(Collectors.toList());
+        types.add("scaled_float"); // have to add manually since scaled_float is in a module
+        NUMERIC_FIELD_MAPPER_TYPES = types;
+    }
+
     /**
      * Format to the appropriate Rollup field name convention
      *

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/rollup/job/HistoGroupConfig.java

@@ -51,10 +51,6 @@ public class HistoGroupConfig implements Writeable, ToXContentFragment {
 
     private static final ParseField INTERVAL = new ParseField("interval");
     private static final ParseField FIELDS = new ParseField("fields");
-    private static final List<String> MAPPER_TYPES = Stream.of(NumberFieldMapper.NumberType.values())
-            .map(NumberFieldMapper.NumberType::typeName)
-            .collect(Collectors.toList());
-
 
     private final long interval;
     private final String[] fields;
@@ -126,7 +122,7 @@ public void validateMappings(Map<String, Map<String, FieldCapabilities>> fieldCa
             Map<String, FieldCapabilities> fieldCaps = fieldCapsResponse.get(field);
             if (fieldCaps != null && fieldCaps.isEmpty() == false) {
                 fieldCaps.forEach((key, value) -> {
-                    if (MAPPER_TYPES.contains(key)) {
+                    if (RollupField.NUMERIC_FIELD_MAPPER_TYPES.contains(key)) {
                         if (value.isAggregatable() == false) {
                             validationException.addValidationError("The field [" + field + "] must be aggregatable across all indices, " +
                                     "but is not.");

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/rollup/job/MetricConfig.java

@@ -66,15 +66,6 @@ public class MetricConfig implements Writeable, ToXContentFragment {
     private static final ParseField AVG = new ParseField("avg");
     private static final ParseField VALUE_COUNT = new ParseField("value_count");
 
-    private static final List<String> MAPPER_TYPES;
-    static {
-        List<String> types = Stream.of(NumberFieldMapper.NumberType.values())
-                .map(NumberFieldMapper.NumberType::typeName)
-                .collect(Collectors.toList());
-        types.add("scaled_float"); // have to add manually since scaled_float is in a module
-        MAPPER_TYPES = types;
-    }
-
     public static final ObjectParser<MetricConfig.Builder, Void> PARSER = new ObjectParser<>(NAME, MetricConfig.Builder::new);
 
     static {
@@ -153,7 +144,7 @@ public void validateMappings(Map<String, Map<String, FieldCapabilities>> fieldCa
         Map<String, FieldCapabilities> fieldCaps = fieldCapsResponse.get(field);
         if (fieldCaps != null && fieldCaps.isEmpty() == false) {
             fieldCaps.forEach((key, value) -> {
-                if (MAPPER_TYPES.contains(key)) {
+                if (RollupField.NUMERIC_FIELD_MAPPER_TYPES.contains(key)) {
                     if (value.isAggregatable() == false) {
                         validationException.addValidationError("The field [" + field + "] must be aggregatable across all indices, " +
                                 "but is not.");

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/rollup/job/HistoGroupConfigSerializingTests.java

@@ -11,6 +11,7 @@
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.test.AbstractSerializingTestCase;
 import org.elasticsearch.xpack.core.rollup.ConfigTestHelpers;
+import org.elasticsearch.xpack.core.rollup.RollupField;
 
 import java.io.IOException;
 import java.util.Collections;
@@ -111,7 +112,8 @@ public void testValidateMatchingField() throws IOException {
         // Have to mock fieldcaps because the ctor's aren't public...
         FieldCapabilities fieldCaps = mock(FieldCapabilities.class);
         when(fieldCaps.isAggregatable()).thenReturn(true);
-        responseMap.put("my_field", Collections.singletonMap("long", fieldCaps));
+        String mappingType = randomFrom(RollupField.NUMERIC_FIELD_MAPPER_TYPES);
+        responseMap.put("my_field", Collections.singletonMap(mappingType, fieldCaps));
 
         HistoGroupConfig config = new HistoGroupConfig.Builder()
                 .setFields(Collections.singletonList("my_field"))