[SOLR-5683] Documentation of Suggester V2 - ASF JIRA

[SOLR-5683] Documentation of Suggester V2 - ASF JIRA

The new Suggester Component allows Solr to fully utilize the Lucene suggesters.
The main features are:

• lookup pluggability (TODO: add description):
  • AnalyzingInfixLookupFactory
  • AnalyzingLookupFactory
  • FuzzyLookupFactory
  • FreeTextLookupFactory
  • FSTLookupFactory
  • WFSTLookupFactory
  • TSTLookupFactory
  • JaspellLookupFactory
• Dictionary pluggability (give users the option to choose the dictionary implementation to use for their suggesters to consume)
  • Input from search index
    • DocumentDictionaryFactory – user can specify suggestion field along with optional weight and payload fields from their search index.
    • DocumentExpressionFactory – same as DocumentDictionaryFactory but allows users to specify arbitrary expression using existing numeric fields.
    • HighFrequencyDictionaryFactory – user can specify a suggestion field and specify a threshold to prune out less frequent terms.
  • Input from external files
    • FileDictionaryFactory – user can specify a file which contains suggest entries, along with optional weights and payloads.

Config (index time) options:

• name - name of suggester
• sourceLocation - external file location (for file-based suggesters)
• lookupImpl - type of lookup to use [default JaspellLookupFactory]
• dictionaryImpl - type of dictionary to use (lookup input) [default
  (sourceLocation == null ? HighFrequencyDictionaryFactory : FileDictionaryFactory)]
• storeDir - location to store in-memory data structure in disk
• buildOnCommit - command to build suggester for every commit
• buildOnOptimize - command to build suggester for every optimize

Query time options:

• suggest.dictionary - name of suggester to use (can occur multiple times for batching suggester requests)
• suggest.count - number of suggestions to return
• suggest.q - query to use for lookup
• suggest.build - command to build the suggester
• suggest.reload - command to reload the suggester
• buildAll – command to build all suggesters in the component
• reloadAll – command to reload all suggesters in the component

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