return json data instead of echoing, for AJAX callbacks and reindexing/settings pushing.

Author: tw2113

includes/admin/class-algolia-admin.php

@@ -272,7 +272,9 @@ public function re_index() {
 
 			wp_send_json( $response );
 		} catch ( Exception $exception ) {
-			echo esc_html( $exception->getMessage() );
+			wp_send_json( [
+				'responseText' => $exception->getMessage()
+			] );
 			throw $exception;
 		}
 	}
@@ -307,7 +309,9 @@ public function push_settings() {
 			);
 			wp_send_json( $response );
 		} catch ( Exception $exception ) {
-			echo esc_html( $exception->getMessage() );
+			wp_send_json( [
+				'responseText' => $exception->getMessage()
+			] );
 			throw $exception;
 		}
 	}