Catalogue Search Indexer Unknown Error

Question

I'm having problems getting the Catalog Search indexer to complete. All other indexers are fine.

Here's the exact error taking from shell

Catalog Search indexer process unknown error:
Notice: Undefined offset: 1 in 
/home/tbyte/public_html/vendor/magento/module-catalog- 
search/Model/Indexer/Fulltext/Action/Full.php on line 384

Inside full.php on line 384 is this:

$productIndex = [$productData['entity_id'] => $productsAttributes[$productData['entity_id']]];

indexer:status shows 0 in backlog but catalog search status as Reindex Required.

I've tried the following to no avail:

1. Reinstall of Magento by renaming env.php
2. Commands such as setup:di:compile, db-schema upgrades, cache:clean etc

This problem is stopping products from being displayed on the front end.

I'm running Magento 2.2.6

Answer 1

If anyone else has the same problem, I changed the PHP Version from 7.0 to 7.1 and enabled the same PHP Extensions and PHP Directives as previous version using EasyApache 4 in WHM. Import of products and reindex breezed through.