[Docs] Add definitions to glossary
Definitions for "filter" and "query" are added to the glossary of terms.
Closes
`object`. The mapping also allows you to define (amongst other things)
how the value for a field should be analyzed.
+[[glossary-filter]] filter ::
+
+ A filter is a non-scoring <<glossary-query,query>>, meaning that it does not score documents.
+ It is only concerned about answering the question - "Does this document match?".
+ The answer is always a simple, binary yes or no. This kind of query is said to be made
+ in a <<query-filter-context,filter context>>,
+ hence it is called a filter. Filters are simple checks for set inclusion or exclusion.
+ In most cases, the goal of filtering is to reduce the number of documents that have to be examined.
+
[[glossary-index]] index ::
An index is like a _table_ in a relational database. It has a
+
See also <<glossary-routing,routing>>
+[[glossary-query]] query ::
+
+ A query is the basic component of a search. A search can be defined by one or more queries
+ which can be mixed and matched in endless combinations. While <<glossary-filter,filters>> are
+ queries that only determine if a document matches, those queries that also calculate how well
+ the document matches are known as "scoring queries". Those queries assign it a score, which is
+ later used to sort matched documents. Scoring queries take more resources than <<glossary-filter,non scoring queries>>
+ and their query results are not cacheable. As a general rule, use query clauses for full-text
+ search or for any condition that requires scoring, and use filters for everything else.
+
[[glossary-replica-shard]] replica shard ::
Each <<glossary-primary-shard,primary shard>> can have zero or more
A term is an exact value that is indexed in Elasticsearch. The terms
`foo`, `Foo`, `FOO` are NOT equivalent. Terms (i.e. exact values) can
- be searched for using _term_ queries. +
+ be searched for using _term_ queries.
+ +
See also <<glossary-text,text>> and <<glossary-analysis,analysis>>.
[[glossary-text]] text ::
