Disable JSON pretty print for ElasticSearch bulk API

[rhertogh]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	-

This PR disables JSON pretty print for ElasticSearch bulk API since it uses new lines as delimiter.
From the ElasticSearch bulk API documentation:

Because this format uses literal \n's as delimiters, make sure that the JSON actions and sources are not pretty printed.

[what-the-diff]

PR Summary

• Enhancement of JSON encoding in the Yii framework's BulkCommand
  The developer team has implemented a feature that improves the presentation of JSON encoded data when using the BulkCommand in the Yii framework, a popular PHP framework. This enhancement, known as "pretty printing," enhances the readability of the data by implementing a more organized, multi-line format. This change will cater to improved debugging and interaction with the JSON data, thus accelerating the problem-solving speed and efficacy.