why would the executor by default only have 1 thread?

spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/configuration/ZeebeClientAllAutoConfiguration.java

@@ -12,6 +12,7 @@
 import io.camunda.zeebe.spring.client.metrics.MetricsRecorder;
 import io.camunda.zeebe.spring.client.properties.PropertyBasedZeebeWorkerValueCustomizer;
 import io.camunda.zeebe.spring.client.properties.ZeebeClientConfigurationProperties;
+import java.util.concurrent.Executors;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -37,7 +38,9 @@ public ZeebeClientAllAutoConfiguration(
   @Bean
   @ConditionalOnMissingBean
   public ZeebeClientExecutorService zeebeClientExecutorService() {
-    return ZeebeClientExecutorService.createDefault();
+    return new ZeebeClientExecutorService(
+        Executors.newScheduledThreadPool(
+            configurationProperties.getNumJobWorkerExecutionThreads()));
   }
 
   @Bean