Port to ES 5.5.0

Author: mbok

gradle.properties

@@ -1,7 +1,7 @@
-elasticsearch.version=5.3.0
-log4j.version=2.8
+elasticsearch.version=5.5.0
+log4j.version=2.8.2
 wagon-ssh-external.version=2.10
 commons-math3.version=3.6.1
 group=org.scaleborn.elasticsearch.plugin
 name=elasticsearch-linear-regression
-version=5.3.0.2
+version=5.5.0.1

src/main/java/org/scaleborn/elasticsearch/linreg/aggregation/predict/PredictionResults.java

@@ -20,7 +20,7 @@
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.search.aggregations.InternalAggregation.CommonFields;
+import org.elasticsearch.search.aggregations.Aggregation.CommonFields;
 import org.scaleborn.elasticsearch.linreg.aggregation.support.ModelResults;
 import org.scaleborn.linereg.estimation.SlopeCoefficients;
 
@@ -52,7 +52,7 @@ public void writeTo(final StreamOutput out) throws IOException {
   @Override
   public XContentBuilder toXContent(final XContentBuilder builder, final Params params)
       throws IOException {
-    builder.field(CommonFields.VALUE, this.predictedValue);
+    builder.field(CommonFields.VALUE.toString(), this.predictedValue);
     return super.toXContent(builder, params);
   }