Bug Report: Describe the issue

**Describe the bug**
A clear and concise description of what the bug is.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '...'
3. Scroll down to '...'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
- OS: [e.g. Windows, MacOS, Linux]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Additional context**
Add any other context about the problem here.

The issue body is only the default bug-report template and names no files, tests, or entry points. Provide a concrete symptom, reproduction steps, expected behavior, and environment first; done cannot be defined until the affected behavior and scope are specified.

索引モデルが issue の本文から書いたものです。