Enable fulltext analyzer on ecm:binaryText by default

es highlights will be leveraged in Web UI for 9.2 but we won't have highlights on Binary content by default (as shown in the attached picture).

In order to have such highlight, we need to enable the analyzer on the ecm:binarytext field as stated in the doc.

It's a pity that we don't have such highlight by default in the platform. On the other hand, enabling it by default could have a significant cost at indexing and storage level depending on the volume of binary text.

The plan is to enable this fulltext analyzer by default and add some documentation on how to tune elasticsearch performances by disabling it again.