Google Search Appliance Protocol Reference Manual de usuario descargar pdf (Pagina 31)

Google Search Appliance: Search Protocol Reference Request Format 31

Automatic Filtering

Google uses automatic filtering to ensure the highest quality search results.

Google search uses two types of automatic filters:

• Duplicate Snippet Filter—If multiple documents contain identical titles as well as the same

information in their snippets in response to a query, only the most relevant document of that set is

displayed in the results.

• Duplicate Directory Filter—If there are many results in a single web directory, then only the two

most relevant results for that directory are displayed. An output flag indicates that more results are

available from that directory.

By default, both of these filters are enabled. You can disable or enable the filters by using the

filter

parameter settings as shown in the table.

When a search filter is enabled and removes some results, the search results output indicates that

results were filtered. See “Appendix A: Estimated vs. Actual Number of Results” on page 105 for more

information about how a filtered result set is identified and for recommendations for displaying the

results.

Although the

filter=0

option exists, Google recommends against setting

filter=0

for typical search

requests, because filtering significantly enhances the quality of most search results.

For queries that contain the

site

special query term or the

as_sitesearch

query parameter,

automatic filtering does not take place.

When the Google Search Appliance filters results, the top 1000 most relevant URLs are found before the

filters are applied. A URL that is beyond the top 1000 most relevant results is not affected if you change

the filter settings.

Language Filters

Language filters limit a search to pages in the specified languages. The Google Search Appliance has

built-in language filters that detect the language of a query and return appropriate results. You can

combine language filters to further restrict search results.

Note: When the search appliance receives a language-restricted search request for which there are no

results in the languages specified by a filter, it displays search results in all languages.

This section covers:

• “Automatic Language Filters” on page 32

• “Combining Language Filters” on page 34

Filter value Duplicate Snippet Filter Duplicate Directory Filter

filter=1

Enabled (ON) Enabled (ON)

filter=0

Disabled (OFF) Disabled (OFF)

filter=s

Disabled (OFF) Enabled (ON)

filter=p

Enabled (ON) Disabled (OFF)

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