Editing Troubleshooting of Google Vertex AI Search (section)

=== Troubleshooting: "Requested Entity Already Exists" Error When Saving Data Stores ===

'''Error:'''
When saving site indexing, the following error message appears<ref>[https://cloud.google.com/datastore/docs/concepts/errors Errors and Error Handling  |  Cloud Datastore Documentation  |  Google Cloud]</ref>:
<pre>
Failed to save sites
Requested entity already exists
Tracking number: <mix of English and numeric characters>
</pre>

'''Root Cause:'''
Conflicting URL patterns exist simultaneously in "Specify URL patterns to index":
<pre>
example.com
</pre>
and
<pre>
*.example.com/*
</pre>

These two patterns conflict with each other, causing the system to treat them as duplicate entities. The detailed linking rules are mentioned in the official documentation:
<pre>
You can use the operations listed below
Entire site: www.mysite.com/*
Parts of site: www.mysite.com/faq/*
Entire domain: *.mysite.com/*
Quotes for exact match: "www.mysite.com/faq"
Sites without quotes will match any path after the specified address:
www.mysite.com/faq → www.mysite.com/faq*.
</pre>

'''Solution:'''
Simply remove one of the patterns to resolve the issue. It's recommended to keep the broader pattern <code>*.example.com/*</code> as it already includes <code>example.com</code>.