Upgrade to ES 6.8.21 and release version 6.8.21.0

Author: vvanholl

README.md

@@ -27,6 +27,7 @@ It collects all relevant metrics and makes them available to Prometheus via the
 
 | Elasticsearch  | Plugin         | Release date |
 | -------------- | -------------- | ------------ |
+| 6.8.21         | 6.8.21.0       | Dec 14, 2021 |
 | 6.8.20         | 6.8.20.0       | Oct 16, 2021 |
 | 6.8.19         | 6.8.19.0       | Oct 02, 2021 |
 | 6.8.18         | 6.8.18.0       | Aug 07, 2021 |
@@ -81,7 +82,7 @@ It collects all relevant metrics and makes them available to Prometheus via the
 
 ## Install
 
-`./bin/elasticsearch-plugin install -b https://github.com/vvanholl/elasticsearch-prometheus-exporter/releases/download/6.8.20.0/prometheus-exporter-6.8.20.0.zip`
+`./bin/elasticsearch-plugin install -b https://github.com/vvanholl/elasticsearch-prometheus-exporter/releases/download/6.8.21.0/prometheus-exporter-6.8.21.0.zip`
 
 **Do not forget to restart the node after the installation!**
 

build.gradle

@@ -8,7 +8,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.elasticsearch.gradle:build-tools:6.8.20" // How can we use ${versions.elasticsearch} here ???
+        classpath "org.elasticsearch.gradle:build-tools:6.8.21" // How can we use ${versions.elasticsearch} here ???
         classpath group: 'javax.xml.bind', name: 'jaxb-api', version: '2.3.0'
         classpath group: 'com.sun.xml.bind', name: 'jaxb-core', version: '2.3.0'
         classpath group: 'com.sun.xml.bind', name: 'jaxb-impl', version: '2.3.0'

gradle.properties

@@ -1,6 +1,6 @@
 group = org.elasticsearch.plugin.prometheus
 
-version = 6.8.20.1-SNAPSHOT
+version = 6.8.21.0
 
 pluginName = prometheus-exporter
 pluginClassname = org.elasticsearch.plugin.prometheus.PrometheusExporterPlugin