Zabbix 5.0 and ES 7.7 -> array_key_exists() expects parameter 2 to be array, string given

hello!
After upgrading my local zabbix installation from 4.4 to 5.0 I always get this error message when looking at history of "text" and "character" items:

the history is properly shown anyways, but I get the error message at the top of the page.

As mentioned above, I'm using Elasticserach as backend for all the history tables, this is the web configuration:

$HISTORY['url']   = [
  'uint' => 'http://elasticsearch:9200',
  'dbl' => 'http://elasticsearch:9200',
  'text' => 'http://elasticsearch:9200',
  'log' => 'http://elasticsearch:9200',
  'str' => 'http://elasticsearch:9200'
];

$HISTORY['types'] = ['uint', 'dbl', 'str', 'text', 'log'];

I upgraded Elasticsearch from 6.3.x to 7.7.0 after upgrading to Zabbix 5.0 (and realizing 6.x is not supported anymore).

Let me know if you need additional info!

thanks