[25-3-1] Handle new prefixes in prefixed vector index update

[vitalif]

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

Cherry-pick of #25991, #26046, #25505, #26120

[github-actions]

⚪ 2025-10-06 09:03:10 UTC Pre-commit check linux-x86_64-release-asan for 48b32b7 has started.
⚪ 2025-10-06 09:03:25 UTC Artifacts will be uploaded here
⚪ 2025-10-06 09:07:07 UTC ya make is running...
🔴 2025-10-06 09:18:42 UTC Build failed, see the logs. Also see fail summary

[github-actions]

🟢 2025-10-06 13:33:40 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-10-06 09:05:42 UTC Pre-commit check linux-x86_64-relwithdebinfo for 48b32b7 has started.
⚪ 2025-10-06 09:05:58 UTC Artifacts will be uploaded here
⚪ 2025-10-06 09:09:49 UTC ya make is running...
🔴 2025-10-06 09:17:40 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2025-10-06 09:49:07 UTC Pre-commit check linux-x86_64-release-asan for 87d31c3 has started.
⚪ 2025-10-06 09:49:21 UTC Artifacts will be uploaded here
⚪ 2025-10-06 09:53:02 UTC ya make is running...
🔴 2025-10-06 10:01:04 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2025-10-06 09:49:12 UTC Pre-commit check linux-x86_64-relwithdebinfo for 87d31c3 has started.
⚪ 2025-10-06 09:49:27 UTC Artifacts will be uploaded here
⚪ 2025-10-06 09:53:23 UTC ya make is running...
🔴 2025-10-06 09:59:36 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2025-10-06 10:28:46 UTC Pre-commit check linux-x86_64-relwithdebinfo for 26a6daa has started.
⚪ 2025-10-06 10:28:53 UTC Artifacts will be uploaded here
⚪ 2025-10-06 10:32:38 UTC ya make is running...
🟡 2025-10-06 12:12:56 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40121	37437	0	5	2656	23

⚪ 2025-10-06 12:16:35 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-10-06 12:38:52 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
362 (only retried tests)	340	0	1	1	20

⚪ 2025-10-06 12:39:02 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-10-06 12:53:53 UTC Tests successful.

Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
300 (only retried tests)	282	0	0	1	17

🟢 2025-10-06 12:54:01 UTC Build successful.
🟡 2025-10-06 12:54:20 UTC ydbd size 2.3 GiB changed* by +1.7 MiB, which is >= 100.0 KiB vs stable-25-3-1: Warning

ydbd size dash	stable-25-3-1: ffa4be7	merge: 26a6daa	diff	diff %
ydbd size	2 431 512 312 Bytes	2 433 323 280 Bytes	+1.7 MiB	+0.074%
ydbd stripped size	520 883 400 Bytes	521 208 712 Bytes	+317.7 KiB	+0.062%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-10-06 10:28:46 UTC Pre-commit check linux-x86_64-release-asan for 26a6daa has started.
⚪ 2025-10-06 10:28:55 UTC Artifacts will be uploaded here
⚪ 2025-10-06 10:32:41 UTC ya make is running...
🟡 2025-10-06 12:46:47 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17452	17029	0	173	222	28

🟢 2025-10-06 12:48:14 UTC Build successful.
🔴 2025-10-06 12:48:37 UTC ydbd size 3.8 GiB changed* by +4.1 MiB, which is >= 2.0 MiB vs stable-25-3-1: Alert

ydbd size dash	stable-25-3-1: 6306922	merge: 26a6daa	diff	diff %
ydbd size	4 045 576 216 Bytes	4 049 840 608 Bytes	+4.1 MiB	+0.105%
ydbd stripped size	1 507 074 304 Bytes	1 508 738 560 Bytes	+1.6 MiB	+0.110%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-10-06 13:32:29 UTC Pre-commit check linux-x86_64-release-asan for 5d33ed9 has started.
⚪ 2025-10-06 13:32:42 UTC Artifacts will be uploaded here
⚪ 2025-10-06 13:36:22 UTC ya make is running...
🔴 2025-10-06 13:40:59 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2025-10-06 13:34:55 UTC Pre-commit check linux-x86_64-relwithdebinfo for 5d33ed9 has started.
⚪ 2025-10-06 13:35:10 UTC Artifacts will be uploaded here
⚪ 2025-10-06 13:38:50 UTC ya make is running...
🔴 2025-10-06 13:48:40 UTC Build failed, see the logs. Also see fail summary

[github-actions]

⚪ 2025-10-06 14:23:07 UTC Pre-commit check linux-x86_64-release-asan for 98bb71f has started.
⚪ 2025-10-06 14:23:21 UTC Artifacts will be uploaded here
⚪ 2025-10-06 14:27:02 UTC ya make is running...
🟡 2025-10-06 16:42:10 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17458	17094	0	114	227	23

🟢 2025-10-06 16:43:48 UTC Build successful.
🔴 2025-10-06 16:44:09 UTC ydbd size 3.8 GiB changed* by +4.1 MiB, which is >= 2.0 MiB vs stable-25-3-1: Alert

ydbd size dash	stable-25-3-1: 87705c8	merge: 98bb71f	diff	diff %
ydbd size	4 045 622 256 Bytes	4 049 897 600 Bytes	+4.1 MiB	+0.106%
ydbd stripped size	1 507 090 080 Bytes	1 508 757 600 Bytes	+1.6 MiB	+0.111%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-10-06 14:23:48 UTC Pre-commit check linux-x86_64-relwithdebinfo for 98bb71f has started.
⚪ 2025-10-06 14:24:21 UTC Artifacts will be uploaded here
⚪ 2025-10-06 14:28:47 UTC ya make is running...
🟡 2025-10-06 16:29:51 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40127	37442	0	3	2650	32

⚪ 2025-10-06 16:33:30 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-10-06 16:59:32 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
465 (only retried tests)	444	0	0	1	20

🟢 2025-10-06 16:59:41 UTC Build successful.
🟡 2025-10-06 16:59:58 UTC ydbd size 2.3 GiB changed* by +1.7 MiB, which is >= 100.0 KiB vs stable-25-3-1: Warning

ydbd size dash	stable-25-3-1: 87705c8	merge: 98bb71f	diff	diff %
ydbd size	2 431 544 904 Bytes	2 433 366 840 Bytes	+1.7 MiB	+0.075%
ydbd stripped size	520 889 448 Bytes	521 220 136 Bytes	+322.9 KiB	+0.063%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-10-14 10:39:06 UTC Pre-commit check linux-x86_64-release-asan for acd806a has started.
⚪ 2025-10-14 10:39:10 UTC Artifacts will be uploaded here
⚪ 2025-10-14 10:42:57 UTC ya make is running...
🟡 2025-10-14 13:13:16 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
17501	17023	0	187	273	18

🟢 2025-10-14 13:14:40 UTC Build successful.
🔴 2025-10-14 13:15:03 UTC ydbd size 3.8 GiB changed* by +4.1 MiB, which is >= 2.0 MiB vs stable-25-3-1: Alert

ydbd size dash	stable-25-3-1: ae6708e	merge: acd806a	diff	diff %
ydbd size	4 046 617 160 Bytes	4 050 886 552 Bytes	+4.1 MiB	+0.106%
ydbd stripped size	1 507 495 648 Bytes	1 509 162 848 Bytes	+1.6 MiB	+0.111%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-10-14 10:40:42 UTC Pre-commit check linux-x86_64-relwithdebinfo for acd806a has started.
⚪ 2025-10-14 10:40:56 UTC Artifacts will be uploaded here
⚪ 2025-10-14 10:44:49 UTC ya make is running...