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How do I search for those document in a SOLR index which do not contain a specified field?
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If you do not specify a field in a query, Solr searches only the default field. Alternatively, you can specify a different field or a combination of fields in a query. To specify a field, type the field name followed by a colon ":" and then the term you are searching for within the field.
Phrase match: A simple way by which we can achieve exact matching in Solr is by using the default string type. It is exact phrase matching. the string is a useful type for facet where we search the index by using the text pulled from the index itself.
The fq (Filter Query) Parameter The fq parameter defines a query that can be used to restrict the superset of documents that can be returned, without influencing score. It can be very useful for speeding up complex queries, since the queries specified with fq are cached independently of the main query.
Solr provides Query (q parameter) and Filter Query (fq parameter) for searching. The query (q parameter), as the name suggests, is the main query used for searching. Example. q = title:james. Filter queries are used alongside query (q parameter) to limit results of queries using additional filters.
-field:[* TO *]
In SolrNet, use a negated SolrHasValueQuery
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