Okay. But I tried the indexing 2 weeks ago and it didn’t work. But I’m not sure what the correct indexing procedure is. I did these 3. And nothing worked.
Method 1.
Restart Your iPhone
Try restarting your iPhone, waiting for several minutes and connecting your device to the Wifi network. Then check whether your device finishes indexing.
Method 2.
Toggle on and off Messages button in iCloud
Open Settings > Apple ID > iCloud > Toggle Messages on and off, and then on. After the steps, wait for some time to check.
Method 3.
Toggle on and off Siri & Search in Settings
Step 1. Go to Settings, and tap Siri & Search.
Step 2. Scroll to the Messages app, and toggle off all Siri & Search options if they are already on.
Step 3. Power off your iPhone, wait for a few minutes, and power it on.
Step 4. Go back to Settings, tap Siri & Search > Messages, then toggle green all options.
Step 5. Finally go to the Messages app and check if the indexing is finished.