We intend to modify the search functionality in the new MFE such that:

All searches are initiated from the search bar located next to the Add Post button.
Search button searches:
1. In post title and content when All Posts and My Posts tab is selected.
2. In topics when Topcis tab is selected.
3. In usernames when Learners tab is selected.

Search functionality in general

Tab selected	Show Search info bar	Show Filter/ sort bar	Placeholder text	Search box logic
My posts	Yes	Yes (with same options as without search, reset to default sort upon search)	Search all posts	Same as in legacy. Searches for provided string in post title, content, response and comments.
All posts	Yes	Yes (with same options as without search, reset to default sort upon search)	Search all posts	Same as in legacy. Searches for provided string in post title, content, response and comments.
Topics	Yes	No	Search topics	Same as legacy. Filters topics based on provided string on the frontend.
Learners	Yes	Yes (with same options as without search, reset to default sort upon search)	Search all learners	Same as legacy. Filters users based on provided string. It will still search users when a particular user is selected.

Searching content

The following behaviour is illustrated for when All Posts and My Posts tab is selected.

Action	Mockup
Default view of `All Posts` or `My Posts` tab.
User enters a string in search bar.
User clicks the search icon in search bar.
Search info bar appears on top of list pane. Posts filter bar and post summaries are pushed below the search info bar. Search info bar shows the number of search results and the search string. “Clear results” option can be used to clear search results and return to default state of view in `All posts` or `My posts` tab. Filter bar shall remain available.
In light of currently available APIs, is this sorting and filtering being done on frontend or in cs_comment service?	Legacy view:
Warping long search strings.

The following behaviour is illustrated for when Topics tab is selected.

Actions	Mockup

User enters the search string in search bar.
Search info bar appears on top of list pane. Topic lists or post summaries are pushed below the search info bar. Search info bar shows the number of search results and the search string. “Clear results” option can be used to clear search results and return to default state of view in `Topics` tab.
After rollout of 1.7, will we search 3rd level of hierarchy? How will those results be rendered? This is an open question that Jonathan and I are working on. As of now, we haven’t rolled out 1.7 yet. So the objective is to replicate exactly what is being done in legacy experience. In legacy experience, as per Kshitij, all topics are being loaded on the frontend and searched there.