Fix bug when indexing non-finite numbers

src/main/java/com/graphaware/module/es/util/CustomJestClientFactory.java

@@ -1,12 +1,18 @@
 package com.graphaware.module.es.util;
 
+import com.google.gson.GsonBuilder;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
 import io.searchbox.client.JestClientFactory;
 import io.searchbox.client.config.HttpClientConfig;
 import org.apache.http.impl.client.HttpClientBuilder;
 
 import static com.graphaware.module.es.ElasticSearchConfiguration.DEFAULT_CONNECTION_TIMEOUT;
 import static com.graphaware.module.es.ElasticSearchConfiguration.DEFAULT_READ_TIMEOUT;
 
+import java.io.IOException;
+
 /**
  * Customizations:
  * - connectionManagerShared: true
@@ -37,7 +43,33 @@ public void setHttpClientConfig(HttpClientConfig httpClientConfig) {
         super.setHttpClientConfig(new HttpClientConfig.Builder(httpClientConfig)
                 .readTimeout(readTimeout > 0 ? readTimeout : DEFAULT_READ_TIMEOUT)
                 .connTimeout(connectionTimeout > 0 ? connectionTimeout : DEFAULT_CONNECTION_TIMEOUT)
+                .gson(new GsonBuilder()
+                        .registerTypeAdapter(Double.class, new NonFiniteAsStringAdapter())
+                        .create()
+                )
+                .readTimeout(20000) // 20s
+                .connTimeout(10000) // 10s
                 .build()
         );
     }
 }
+
+/**
+ * Serialize non-finite doubles (-Infinity, +Infinity, NaN) as strings.
+ */
+class NonFiniteAsStringAdapter extends TypeAdapter<Double> {
+    @Override
+    public void write(JsonWriter out, Double value) throws IOException {
+        if (Double.isFinite(value)) {
+            out.value(value);
+        } else {
+            // serialize as "+Infinity", "-Infinity" and "NaN" (string)
+            out.value(value + "");
+        }
+    }
+
+    @Override
+    public Double read(JsonReader in) throws IOException {
+        return in.nextDouble();
+    }
+}

src/test/java/com/graphaware/module/es/ElasticSearchModuleAdvancedMappingTest.java

@@ -58,6 +58,8 @@ protected void writeSomeStuffWithListToNeo4j() {
             node.addLabel(Label.label("LabelWithList2"));
             int[] listOfInteger = {1, 2, 3};
             node.setProperty("listOfInteger", listOfInteger);
+            node.setProperty("infinite-number", Double.NEGATIVE_INFINITY);
+            node.setProperty("nan-number", Double.NaN);
             tx.success();
         }