Remove abstract InternalMetricsAggregation class (elastic#23326)

This class doesn't seem to do much other than to group together
certain types of aggregations.

core/src/main/java/org/elasticsearch/search/aggregations/metrics/InternalNumericMetricsAggregation.java

@@ -20,14 +20,15 @@
 
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.search.DocValueFormat;
+import org.elasticsearch.search.aggregations.InternalAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
 
 import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
-public abstract class InternalNumericMetricsAggregation extends InternalMetricsAggregation {
+public abstract class InternalNumericMetricsAggregation extends InternalAggregation {
 
     private static final DocValueFormat DEFAULT_FORMAT = DocValueFormat.RAW;
 
@@ -118,7 +119,7 @@ public boolean equals(Object obj) {
             return false;
         }
         InternalNumericMetricsAggregation other = (InternalNumericMetricsAggregation) obj;
-        return super.equals(obj) && 
+        return super.equals(obj) &&
                 Objects.equals(format, other.format);
     }
 }

core/src/main/java/org/elasticsearch/search/aggregations/metrics/geobounds/InternalGeoBounds.java

@@ -24,15 +24,14 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.search.aggregations.InternalAggregation;
-import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
 
 import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
-public class InternalGeoBounds extends InternalMetricsAggregation implements GeoBounds {
+public class InternalGeoBounds extends InternalAggregation implements GeoBounds {
     final double top;
     final double bottom;
     final double posLeft;

core/src/main/java/org/elasticsearch/search/aggregations/metrics/geocentroid/InternalGeoCentroid.java

@@ -25,7 +25,6 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.search.aggregations.InternalAggregation;
-import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
 
 import java.io.IOException;
@@ -35,7 +34,7 @@
 /**
  * Serialization and merge logic for {@link GeoCentroidAggregator}.
  */
-public class InternalGeoCentroid extends InternalMetricsAggregation implements GeoCentroid {
+public class InternalGeoCentroid extends InternalAggregation implements GeoCentroid {
     protected final GeoPoint centroid;
     protected final long count;
 

core/src/main/java/org/elasticsearch/search/aggregations/metrics/scripted/InternalScriptedMetric.java

@@ -27,7 +27,6 @@
 import org.elasticsearch.script.Script;
 import org.elasticsearch.script.ScriptContext;
 import org.elasticsearch.search.aggregations.InternalAggregation;
-import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
 
 import java.io.IOException;
@@ -37,7 +36,7 @@
 import java.util.List;
 import java.util.Map;
 
-public class InternalScriptedMetric extends InternalMetricsAggregation implements ScriptedMetric {
+public class InternalScriptedMetric extends InternalAggregation implements ScriptedMetric {
     private final Script reduceScript;
     private final List<Object> aggregation;
 

core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/InternalTopHits.java

@@ -27,11 +27,10 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.lucene.Lucene;
 import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.search.SearchHit;
 import org.elasticsearch.search.SearchHits;
 import org.elasticsearch.search.aggregations.InternalAggregation;
-import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
-import org.elasticsearch.search.SearchHit;
 
 import java.io.IOException;
 import java.util.Arrays;
@@ -41,7 +40,7 @@
 /**
  * Results of the {@link TopHitsAggregator}.
  */
-public class InternalTopHits extends InternalMetricsAggregation implements TopHits {
+public class InternalTopHits extends InternalAggregation implements TopHits {
     private int from;
     private int size;
     private TopDocs topDocs;
@@ -117,7 +116,7 @@ public InternalAggregation doReduce(List<InternalAggregation> aggregations, Redu
             shardDocs = new TopFieldDocs[aggregations.size()];
             for (int i = 0; i < shardDocs.length; i++) {
                 InternalTopHits topHitsAgg = (InternalTopHits) aggregations.get(i);
-                shardDocs[i] = (TopFieldDocs) topHitsAgg.topDocs;
+                shardDocs[i] = topHitsAgg.topDocs;
                 shardHits[i] = topHitsAgg.searchHits;
             }
             reducedTopDocs = TopDocs.merge(sort, from, size, (TopFieldDocs[]) shardDocs);

modules/aggs-matrix-stats/src/main/java/org/elasticsearch/search/aggregations/matrix/stats/InternalMatrixStats.java

@@ -22,7 +22,6 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.search.aggregations.InternalAggregation;
-import org.elasticsearch.search.aggregations.metrics.InternalMetricsAggregation;
 import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
 
 import java.io.IOException;
@@ -35,7 +34,7 @@
 /**
  * Computes distribution statistics over multiple fields
  */
-public class InternalMatrixStats extends InternalMetricsAggregation implements MatrixStats {
+public class InternalMatrixStats extends InternalAggregation implements MatrixStats {
     /** per shard stats needed to compute stats */
     private final RunningStats stats;
     /** final result */