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+---
+page: htroot/IndexReIndexMonitor_p.html
+help: help/IndexReIndexMonitor_p.md
+title: Field Re-Indexing
+package: index-management
+access: admin
+kind: admin-page
+backend_java: source/net/yacy/htroot/IndexReIndexMonitor_p.java
+---
+
+# Field Re-Indexing
+
+## Purpose
+
+Field Re-Indexing rebuilds selected index fields for documents already stored.
+
+Use it after schema, parser, or ranking changes when existing records need recalculation.
+
+## What You Can Do Here
+
+- Field Re-Indexing rebuilds selected index fields for documents already stored.
+- Select the narrowest URL, host, field, query, queue, or collection scope.
+- Treat deletion, rebuilding, and reloading as maintenance operations with visible search impact.
+
+## Page Architecture
+
+Index pages expose stored documents through URL, host, path, Solr field, or queue views. Read-only inspection and destructive maintenance often share the same page, so the target scope matters more than the button label.
+
+| Control | Meaning | Values or examples |
+| --- | --- | --- |
+| `reindexnow` | Solr query. | `start reindex job now` |
+| `stopreindex` | Solr query. | `stop reindexing` |
+| `recrawlquerytext` | Solr query / Edit Solr Query. | Text value; use the page label and surrounding context to choose the exact content. |
+| `simulateRecrawl` | Solr query. | `Simulate` |
+| `includefailedurls` | Include failed URLs / Include failed urls. Options: Include failed URLs, Include failed urls. | Include failed URLs, Include failed urls |
+| `deleteOnRecrawl` | Delete URLs / Delete urls. Options: Delete URLs, Delete urls. | Delete URLs, Delete urls |
+| `recrawlDefaults` | Solr query. | `Set defaults` |
+| `recrawlnow` | Solr query. | `start recrawl job now` |
+| `updquery` | Edit Solr Query. | `update` |
+| `stoprecrawl` | Edit Solr Query. | `stop recrawl job` |
+
+## Correct Use
+
+Use inspection before maintenance. First identify the exact URL, host, field, queue, collection, or query scope, then choose the action. Deletion and re-indexing can be expensive or irreversible from the user's point of view, so never broaden the scope just to make a command easier.
+
+## Access And Safety
+
+Administrator access is required. YaCy protects `_p` pages as administration pages.
+
+Protected related endpoint(s): `/IndexReIndexMonitor_p.html`.
+
+Backend checks: transaction token for protected POST, transaction token issued for forms.
+
+## Automation And API
+
+Page backend: `source/net/yacy/htroot/IndexReIndexMonitor_p.java`.
+
+| Endpoint | Method | Access | Backend |
+| --- | --- | --- | --- |
+| `/IndexReIndexMonitor_p.html` | `POST` | admin | `source/net/yacy/htroot/IndexReIndexMonitor_p.java` |
+
+### Parameter Guide
+
+The table explains values that an agent or script must set deliberately. Parameters not relevant to a task should be omitted or left at the page default.
+
+| Parameter | Meaning and valid values | Care |
+| --- | --- | --- |
+| `reindexnow` | Solr query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `stopreindex` | Solr query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `recrawlquerytext` | Solr query / Edit Solr Query. | Controls the scope or format of the result. Prefer the narrowest value that answers the request. |
+| `simulateRecrawl` | Solr query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `includefailedurls` | Include failed URLs / Include failed urls. Options: Include failed URLs, Include failed urls. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `deleteOnRecrawl` | Delete URLs / Delete urls. Options: Delete URLs, Delete urls. | Can remove data, stop work, expose access, or make a broad operational change. Use only with explicit confirmation and an exact target. |
+| `recrawlDefaults` | Solr query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `recrawlnow` | Solr query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+| `updquery` | Edit Solr Query. | Controls the scope or format of the result. Prefer the narrowest value that answers the request. |
+| `stoprecrawl` | Edit Solr Query. | Set only when this option is part of the intended request; otherwise omit it and let YaCy use the page default. |
+
+Example request shape:
+
+```http
+POST /IndexReIndexMonitor_p.html
+Content-Type: application/x-www-form-urlencoded
+
+reindexnow=...&stopreindex=...&recrawlquerytext=...&simulateRecrawl=...&includefailedurls=...
+```
+
+## What To Expect
+
+The response should make the selected index scope clearer: records listed, queues changed, errors shown, fields rebuilt, or deletion confirmed. Verify user-visible impact with search after maintenance actions.
+
+## Related Pages
+
+- Related index work is usually reached through `IndexBrowser_p.html`, `IndexControlURLs_p.html`, queue pages, deletion pages, or re-indexing monitors.