Drop `search_analyzer` parameter from keyword.asciidoc (#24221)
Drop `search_analyzer` parameter from keyword.asciidoc (#24221)

`search_analyzer` isn't supported by `keyword` fields so this removes
it from the documentation for them.
strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc