Indexer Re-index goes to suspend in Magento 2?

I have 60 million products in my magento 2 store.
I have started indexer:reindex so it will struck on catalog_category_product it shows processing in this and on schedule status it shows suspended in this what’s the issue in this ?

I have reset the indexer for all and for this data also but on again starting it shows suspended .

Any help is appriciated.