Catalog Search indexer process unknown error: cluster_block_exception FORBIDDEN/12/index read-only

Design Config Grid index has been rebuilt successfully in 00:00:00 Customer Grid index has been rebuilt successfully in 00:00:01 Category Products index has been rebuilt successfully in 00:00:00 Product Categories index has been rebuilt successfully in 00:00:00 Catalog Rule Product index has been rebuilt successfully in 00:00:00 Product EAV index has been rebuilt successfully in 00:00:00 Stock index has been rebuilt successfully in 00:00:00 Product Price index has been rebuilt successfully in 00:00:00 Catalog Product Rule index has been rebuilt successfully in 00:00:00 Amasty: Advanced Search  - Categories index has been rebuilt successfully in 00:00:00 Catalog Search indexer process unknown error: {"error":{"root_cause":[{"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow                                                                                                                         delete (api)];"}],"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow delet                                                                                                                        e (api)];"},"status":403} Amasty: ElasticSearch - Relevance Rules (Rules) index has been rebuilt successfully in 00:00:00 Amasty: ElasticSearch - Relevance Rules (Products) index has been rebuilt successfully in 00:00:00 Amasty: ElasticSearch - Popup Data index has been rebuilt successfully in 00:00:00 

how can i solve this issue? this happens sometimes when i try to reindex, i don’t think my index are being reindex correctly even though it returned with success message.