[DOCS] Refactor ingest pipeline docs (#70253)

docs/plugins/ingest.asciidoc

@@ -13,20 +13,4 @@ The core ingest plugins are:
 The ingest attachment plugin lets Elasticsearch extract file attachments in common formats (such as PPT, XLS, and PDF) by
 using the Apache text extraction library https://tika.apache.org/[Tika].
 
-<<ingest-geoip>>::
-
-The `geoip` processor adds information about the geographical location of IP
-addresses, based on data from the Maxmind databases. This processor adds this
-information by default under the `geoip` field. The `geoip` processor is no
-longer distributed as a plugin, but is now a module distributed by default with
-Elasticsearch. See {ref}/geoip-processor.html[GeoIP processor] for more
-details.
-
-<<ingest-user-agent>>::
-
-A processor that extracts details from the User-Agent header value. The
-`user_agent` processor is no longer distributed as a plugin, but is now a module
-distributed by default with Elasticsearch. See
-{ref}/user-agent-processor.html[User Agent processor] for more details.
-
 include::ingest-attachment.asciidoc[]

docs/reference/index-modules.asciidoc

@@ -273,13 +273,15 @@ are ignored for this index.
     The length of time that a <<delete-versioning,deleted document's version number>> remains available for <<index-versioning,further versioned operations>>.
     Defaults to `60s`.
 
+[[index-default-pipeline]]
  `index.default_pipeline`::
 
     The default <<ingest,ingest node>> pipeline for this index. Index requests will fail
     if the default pipeline is set and the pipeline does not exist. The default may be
     overridden using the `pipeline` parameter. The special pipeline name `_none` indicates
     no ingest pipeline should be run.
 
+[[index-final-pipeline]]
  `index.final_pipeline`::
     The final <<ingest,ingest node>> pipeline for this index. Index requests
     will fail if the final pipeline is set and the pipeline does not exist.