Memory index rebuild occupies all memory and oom killed

**Describe the bug**
Will occupy almost full memory and crash later due to oom killer.

**To Reproduce**
rebuild memory index

**Expected behavior**
gets passed

**Screenshots**

<img width="2259" height="1233" alt="Image" src="https://github.com/user-attachments/assets/d05967c7-97c3-4363-807e-f3e6fddeb9d9" />

**Additional context**
no

