Update Process timeout via Config

src/Solr/Reindex/Handlers/SolrReindexImmediateHandler.php

@@ -97,6 +97,13 @@ class SolrReindexImmediateHandler extends SolrReindexBase
 
         // Execute script via shell
         $process = new Process($cmd);
+
+        // Set timeout from config. Process default is 60 seconds.
+        $timeout = Config::inst()->get(static::class, 'process_timeout');
+        if ($timeout) {
+            $process->setTimeout($timeout);
+        }
+
         $process->inheritEnvironmentVariables();
         $process->run();