* Backported open_contexts to ES 5.1.1

#15

README.md

@@ -11,7 +11,7 @@ The data sent to the StatsD server tries to be roughly equivalent to the [Indice
 | Elasticsearch  | Plugin         | Release date |
 | -------------- | -------------- | ------------ |
 | 5.1.2          | 5.1.2.0        | Jan 19, 2017 |
-| 5.1.1          | 5.1.1.0        | Jan 19, 2017 |
+| 5.1.1          | 5.1.1.1        | May 6,  2017 |
 | 5.0.2          | 5.0.2.0        | Jan 4,  2017 |
 | 5.0.1          | 5.0.1.0        | Jan 4,  2017 |
 | 5.0.0          | 5.0.0.0        | Nov 1,  2016 |
@@ -46,12 +46,12 @@ The plugin artifacts are published to Maven Central and Github. To install a pre
 From Github:
 
 ```
-./bin/elasticsearch-plugin install https://github.com/Automattic/elasticsearch-statsd-plugin/releases/download/5.1.2.0/elasticsearch-statsd-5.1.2.0.zip
+./bin/elasticsearch-plugin install https://github.com/Automattic/elasticsearch-statsd-plugin/releases/download/5.1.1.1/elasticsearch-statsd-5.1.1.1.zip
 ```
 
 From Maven Central:
 ```
-./bin/elasticsearch-plugin install http://repo1.maven.org/maven2/com/automattic/elasticsearch-statsd/5.1.2.0/elasticsearch-statsd-5.1.2.0.zip
+./bin/elasticsearch-plugin install http://repo1.maven.org/maven2/com/automattic/elasticsearch-statsd/5.1.1.1/elasticsearch-statsd-5.1.1.1.zip
 ```
 
 Change the version to match your ES version. For ES `x.y.z` the version is `x.y.z.0`
@@ -67,7 +67,7 @@ mvn package -Dtests.security.manager=false
 Once we have the artifact, install it with the following command:
 
 ```
-./bin/elasticsearch-plugin install file:///Users/anandnalya/github/automattic/elasticsearch-statsd-plugin/target/releases/elasticsearch-statsd-5.1.2.0.zip
+./bin/elasticsearch-plugin install file:///Users/anandnalya/github/automattic/elasticsearch-statsd-plugin/target/releases/elasticsearch-statsd-5.1.1.1.zip
 ```
 
 ## Installation Elasticsearch 2.x

pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.automattic</groupId>
     <artifactId>elasticsearch-statsd</artifactId>
-    <version>5.1.2.0</version>
+    <version>5.1.1.1</version>
     <packaging>jar</packaging>
 
     <name>elasticsearch-statsd</name>
@@ -42,7 +42,7 @@
     </developers>
 
     <properties>
-        <elasticsearch.version>5.1.2</elasticsearch.version>
+        <elasticsearch.version>5.1.1</elasticsearch.version>
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>

src/main/java/com/automattic/elasticsearch/statsd/StatsdReporterIndexStats.java

@@ -50,6 +50,7 @@ protected void sendGetStats(String name, GetStats getStats) {
 
     protected void sendSearchStats(String name, SearchStats searchStats) {
         if (null == searchStats) return;
+        this.sendGauge(name, "open_contexts", searchStats.getOpenContexts());
         SearchStats.Stats totalSearchStats = searchStats.getTotal();
         this.sendSearchStatsStats(name, totalSearchStats);