ref(logging): improve sample validation logic for clarity

Signed-off-by: Johnny Hujol <itudoben@users.noreply.github.com>

Author: itudoben

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

@@ -309,13 +309,13 @@ private void checkTestMode(String mode) {
    *
    * @param context The Backend Listener's context
    * @param sr      The current SampleResult
-   * @return true or false depending on whether or not the sample is valid
+   * @return true or false depending on whether the sample is valid
    */
   private boolean validateSample(BackendListenerContext context, SampleResult sr) {
     boolean valid = true;
     String sampleLabel = sr.getSampleLabel().toLowerCase().trim();
 
-    if (this.filters.size() > 0) {
+    if (!this.filters.isEmpty()) {
       for (String filter : filters) {
         Pattern pattern = Pattern.compile(filter);
         Matcher matcher = pattern.matcher(sampleLabel);