70 lines
2.6 KiB
Plaintext
70 lines
2.6 KiB
Plaintext
[[query-dsl-mlt-field-query]]
|
|
=== More Like This Field Query
|
|
|
|
The `more_like_this_field` query is the same as the `more_like_this`
|
|
query, except it runs against a single field. It provides nicer query
|
|
DSL over the generic `more_like_this` query, and support typed fields
|
|
query (automatically wraps typed fields with type filter to match only
|
|
on the specific type).
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
{
|
|
"more_like_this_field" : {
|
|
"name.first" : {
|
|
"like_text" : "text like this one",
|
|
"min_term_freq" : 1,
|
|
"max_query_terms" : 12
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
|
|
`more_like_this_field` can be shortened to `mlt_field`.
|
|
|
|
The `more_like_this_field` top level parameters include:
|
|
|
|
[cols="<,<",options="header",]
|
|
|=======================================================================
|
|
|Parameter |Description
|
|
|`like_text` |The text to find documents like it, *required*.
|
|
|
|
|`percent_terms_to_match` |The percentage of terms to match on (float
|
|
value). Defaults to `0.3` (30 percent).
|
|
|
|
|`min_term_freq` |The frequency below which terms will be ignored in the
|
|
source doc. The default frequency is `2`.
|
|
|
|
|`max_query_terms` |The maximum number of query terms that will be
|
|
included in any generated query. Defaults to `25`.
|
|
|
|
|`stop_words` |An array of stop words. Any word in this set is
|
|
considered "uninteresting" and ignored. Even if your Analyzer allows
|
|
stopwords, you might want to tell the MoreLikeThis code to ignore them,
|
|
as for the purposes of document similarity it seems reasonable to assume
|
|
that "a stop word is never interesting".
|
|
|
|
|`min_doc_freq` |The frequency at which words will be ignored which do
|
|
not occur in at least this many docs. Defaults to `5`.
|
|
|
|
|`max_doc_freq` |The maximum frequency in which words may still appear.
|
|
Words that appear in more than this many docs will be ignored. Defaults
|
|
to unbounded.
|
|
|
|
|`min_word_length` |The minimum word length below which words will be
|
|
ignored. Defaults to `0`. (Old name "min_word_len" is deprecated)
|
|
|
|
|`max_word_length` |The maximum word length above which words will be
|
|
ignored. Defaults to unbounded (`0`). (Old name "max_word_len" is deprecated)
|
|
|
|
|`boost_terms` |Sets the boost factor to use when boosting terms.
|
|
Defaults to deactivated (`0`). Any other value activates boosting with given
|
|
boost factor.
|
|
|
|
|`boost` |Sets the boost value of the query. Defaults to `1.0`.
|
|
|
|
|`analyzer` |The analyzer that will be used to analyze the text.
|
|
Defaults to the analyzer associated with the field.
|
|
|=======================================================================
|
|
|