Dependencies: Update to Elasticsearch 6.4.0

implies gradle wrapper upgrade to 4.9

Author: spinscale

README.md

@@ -6,6 +6,7 @@ Uses the [langdetect](https://github.com/YouCruit/language-detection/) plugin to
 
 | ES    | Command |
 | ----- | ------- |
+| 6.4.0 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/6.4.0.1/ingest-langdetect-6.4.0.1.zip` |
 | 6.3.2 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/6.3.2.1/ingest-langdetect-6.3.2.1.zip` |
 | 6.3.1 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/6.3.1.1/ingest-langdetect-6.3.1.1.zip` |
 | 6.3.0 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/6.3.0.1/ingest-langdetect-6.3.0.1.zip` |

build.gradle

@@ -8,7 +8,7 @@ buildscript {
   }
 
   dependencies {
-    classpath "org.elasticsearch.gradle:build-tools:6.3.2"
+    classpath "org.elasticsearch.gradle:build-tools:6.4.0"
   }
 }
 
@@ -18,7 +18,7 @@ plugins {
 }
 
 group = 'de.spinscale.elasticsearch.plugin'
-version = '6.3.2.1-SNAPSHOT'
+version = '6.4.0.1-SNAPSHOT'
 
 apply plugin: 'java'
 apply plugin: 'idea'

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists