Larger blogs get better search reputation, all other details being equal. While your blog is being reindexed, after you enable "HTTPS Redirect", you will have a blog with two different base URLs - and both URLs will reference two smaller blogs, and have lower search reputation.
All posts in your blog will not be reindexed under an HTTPS URL, immediately. Some posts will remain indexed under the HTTP URL, as others are re indexed under the HTTPS URL, one by one. While being reindexed, your blog will look like two smaller blogs - and both URLs will suffer from lowered search reputation.
During the migration from HTTP to HTTPS, your blog will suffer from lowered search reputation.
Since every blog and website must be upgraded to HTTPS, the lower search reputation - and temporary traffic loss - can't be avoided.
Migration to an HTTPS URL will resemble migration to a custom domain URL.
As your blog is being reindexed using an HTTPS URL, it will have two base URLs - "http", and "https". Both URLs will reference smaller blogs - and both smaller blogs will have lower search reputation. Lower search reputation will slow the reindexing process.
- While re indexing of the blog is in progress, you'll have some posts indexed under the HTTP URL, and other posts indexed under the HTTPS URL.
- As additional posts are indexed under the HTTPS URL, those same posts will drop from indexing under the HTTP URL.
- You get better reputation with all content indexed under one base URL - and this won't be the case until the migration is complete. With the indexing of the blog split between the two base URLs, the reputation overall will be lower.
- With lower reputation, your posts will have poorer SERP position - some posts indexed under the old HTTP URL, others under the new HTTPS URL - though all SERP entries will get your readers to the blog.
- With poorer SERP position overall, you'll have a period of less search originated traffic.
- The more often that you publish, during the migration, the more you'll compensate for the drop in reader traffic.
- As the blog is reindexed under the new URL, reputation for the HTTPS base URL will pick up.
- When the blog is completely reindexed under the new URL, the HTTPS base URL will recover the previous HTTP base URL - and more.
- Use two Search Console properties to monitor the reindexing process - one property for the blog, using "HTTP", and a second using "HTTPS". Check both, regularly.
Until the reindexing is complete, both smaller blogs will have lower search reputation - and less search related traffic - and this will lead to still lower search reputation, and still less traffic. Lather, rinse, repeat.
To migrate your blog from HTTP to HTTPS, you have to endure a period of less search related traffic. It's painful - but since the upgrade is inevitable, the traffic loss can't be avoided. Like migration to a custom domain URL, you can minimise the traffic loss, with proper planning.
We'll use this blog as a case study, and examine the traffic loss during migration. We'll start with the blog having "HTTPS Availability" enabled, and "HTTPS Redirect" disabled, as a baseline.
Right now, this blog is indexed as "http://blogging.nitecruzr.net/".
"HTTPS Availability" is enabled, and "HTTP Redirect" is disabled. All "HTTP" references redirect to "http://blogging.nitecruzr.net/" - and all "HTTPS" references redirect to "https://blogging.nitecruzr.net/". Note the oddity with the domain root redirection, where domain root post URLs may redirect to the home page - this may affect both re indexing, and reader access.
>Redirect Check view.
>Home page view.
>Redirect Check view.
>Home page view.
With the URLs identified, let's watch the indexing process.
To monitor the re indexing, we'll use daily Search Console "Overview" reports for "http://blogging.nitecruzr.net" and "https://blogging.nitecruzr.net".
Please - keep this in perspective, and remember that all pages won't be indexed, at any time.
Google doesn't crawl all the pages on the web, and we don't index all the pages we crawl. It's perfectly normal for not all the pages on a site to be indexed.
OK, if you're reading this, you probably see it using HTTPS. Now, we'll see how well the reindexing goes.
>That's it! I moved this blog forward!
We are now Google approved!
>The seal of approval.
So, here we go!
The process of re indexing a #Blogger blog under an "HTTPS" base URL will lead to temporary lower search reputation, and less search related traffic. Since HTTPS reindexing must happen, the traffic loss can't be avoided.
After the blog is completely reindexed, search reputation - and traffic - will return.
Source : http://blogging.nitecruzr.net/2018/09/https-migration-managing-traffic.html