Add generate_mapping to Post and Comment Indexable

[rebeccahum]

Description of the Change

The User and Term Indexable classes have the generate_mapping() function:

ElasticPress/includes/classes/Indexable/User/User.php

Line 753 in 9a04a23

public function generate_mapping() {

ElasticPress/includes/classes/Indexable/Term/Term.php

Line 587 in 424ba22

public function generate_mapping() {

It would be nice if the Post and Comment Indexable could have that same function, so we can piggyback onto it with some code via $indexable->generate_mapping().

Alternate Designs

N/A.

Possible Drawbacks

N/A.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

Added - generate_mapping() to post and comment indexable

Credits

Props @rebasaurus

[felipeelia]

@rebeccahum I guess if we are aiming to make that a pattern across all Indexables, we should change the parent Indexable class, perhaps with a check to keep backward compatibility. What do you think?

[rebeccahum]

@felipeelia Let me know if this is what you had in mind.