solr help

solr_help.txt

Analyzer
  - Tokenizer
  - Series of filters
StandardAnalyzer
  - StandardTokenizer
  - StandardFilter, LowercaseFilter, StopFilter
Stemming:
  - Swimming -> Swim, catlike, cattly -> cat
  - Create custom Analyzer, override createComponents()
  - PorterStemFilter
TermQuery:
  - Singe word only
  - Just name of the field and the term. No wildcard etc.
NGramTokenizer:
  - asifq, 3 -> asi, sif, ifq 
TermRangeQuery:
  - Range for terms (e.g. get all documents with terms x to y, lexical order)
NumericRangeQuery:
  - like TermRangeQuery, but for numeric values.
PrefixQuery:
  - Prefix search
PhraseQuery:
  - Multiple words
  - Specify words and distance between them
BooleanQuery:
  - Search multiple fields
  - AND, OR, NOT combinations. MUST, SHOULD etc can be specified.
QueryParser:
  - Another way of querying instead of directly using lucene's api methods.
  
NGramTokenizer:
  - Good for efficient embedded search (as opposed to inefficient wildcard queries).
  
  In Solr, at times, there could be duplications between Tokenizers and Filters. Example: EdgeNGramTokenizerFactory and EdgeNGramFilterFactory.