Added the "exclude" feature in the filters

Version 2.7.0

Author: agauthier-nbc

README.md

@@ -16,6 +16,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
   * By making bulk requests, there are practically no impacts on the performance of the tests themselves. 
 * Filters
   * Only send the samples you want by using Filters! Simply type them as follows in the field ``es.sample.filter`` : ``filter1;filter2;filter3`` or ``sampleLabel_must_contain_this``.
+  * You can also choose to exclude certain samplers; `!!exclude_this;filter1;filter2`
 * Specific fields ```field1;field2;field3`
   * Specify fields that you want to send to ElasticSearch (possible fields below)
      * AllThreads

pom.xml

@@ -5,7 +5,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>io.github.delirius325</groupId>
 	<artifactId>jmeter.backendlistener.elasticsearch</artifactId>
-	<version>2.6.11</version>
+	<version>2.7.0</version>
 	<packaging>jar</packaging>
 
 	<name>jmeter.backendlistener.elasticsearch</name>

src/main/java/io/github/delirius325/jmeter/backendlistener/elasticsearch/ElasticsearchBackendClient.java

@@ -282,7 +282,7 @@ private boolean validateSample(BackendListenerContext context, SampleResult sr)
                 Pattern pattern = Pattern.compile(filter);
                 Matcher matcher = pattern.matcher(sampleLabel);
 
-                if (sampleLabel.contains(filter) || matcher.find()) {
+                if (!sampleLabel.startsWith("!!") && (sampleLabel.contains(filter) || matcher.find())) {
                     valid = true;
                     break;
                 } else {