docs(15.9): Google Cloud Storage moved to the fess-lib-gcs plugin

[marevol]

Depends on codelibs/fess#3424, which takes the Google Cloud Storage SDK out of the distribution. From 15.9 on, gcs:// crawling and the gcs storage type come from the fess-lib-gcs plugin.

install/upgrade.rst

A sixth incompatible change for 15.9, next to the other two things that left the distribution. It names the plugin, both install routes, and what an installation sees if it upgrades without installing it:

• a file crawl configuration whose path begins with gcs: is rejected as an invalid protocol
• the storage page reports that no client is registered for storage.type=gcs

Neither fails with a missing class. The section intro moves from five changes to six.

The shipped default of crawler.file.protocols

gcs is gone from it, so the documented default becomes file,smb,smb1,ftp,s3 in install/upgrade.rst, config/crawler-advanced.rst (both the property table and the configuration example) and config/properties.rst. The plugin adds gcs back at runtime when it is installed, through ProtocolHelper#addFileProtocol, so the effective value with the plugin is unchanged — it is the shipped value that differs.

Where GCS is configured

The same short prerequisite note goes on the three pages that tell a reader how to set GCS up: the GCS Crawler section of config/crawler-advanced.rst, the GCS Settings of admin/storage-guide.rst, and the GCS bucket example of admin/fileconfig-guide.rst. The gcs:// entry in the crawl-path list and the GCS storage type in admin/general-guide.rst say the plugin is required.

dev/plugin-architecture.rst

The page lists the plugin types Fess derives from the artifact prefix and was missing fess-lib-*, which PluginHelper.ArtifactType has carried since #3418. fess-lib-gcs is the first plugin of that type, so the row is added here rather than in a separate change.

The ZIP figure

The Node.js section's 438.5 MiB → 218.9 MiB becomes 204.7 MiB. The 14.2 MiB is measured, not estimated: the compressed size of the 30 archive entries the change removes, less the three older jars it puts back (grpc-api, stax2-api and woodstox-core each return to the version their remaining consumer asks for).

Coverage

All seven languages, 42 files. Three pages were left alone rather than translated as part of this change, all pre-existing gaps: ko/admin/storage-guide.rst has no storage server configuration section (73 lines against 97), ko/admin/fileconfig-guide.rst has no S3/GCS crawl examples (198 against 245), and config/properties.rst exists only in English.

Verification

Each of the 42 files was parsed with docutils before and after the edit using doctitle_xform=False, the way Sphinx parses, and the results compared:

• no new system messages
• no markup left unparsed in the rendered text — the check that catches CJK-adjacent inline markup, which fails silently on the start-string side
• the same number of top-level sections, which is what catches a heading underline whose length does not match the title's display width

The new section titles carry CJK text, so their underlines were generated from unicodedata.east_asian_width rather than counted by hand.