[Elasticsearch] multi match query types

multi match query 에서 사용하는 type 설명 입니다.

그냥 소스코드에서 발췌 했습니다.

[MultiMatchQueryBuilder.java]

/**
 * Uses the best matching boolean field as main score and uses
 * a tie-breaker to adjust the score based on remaining field matches
 */
BEST_FIELDS(MatchQuery.Type.BOOLEAN, 0.0f, new ParseField("best_fields", "boolean")),

/**
 * Uses the sum of the matching boolean fields to score the query
 */
MOST_FIELDS(MatchQuery.Type.BOOLEAN, 1.0f, new ParseField("most_fields")),

/**
 * Uses a blended DocumentFrequency to dynamically combine the queried
 * fields into a single field given the configured analysis is identical.
 * This type uses a tie-breaker to adjust the score based on remaining
 * matches per analyzed terms
 */
CROSS_FIELDS(MatchQuery.Type.BOOLEAN, 0.0f, new ParseField("cross_fields")),

/**
 * Uses the best matching phrase field as main score and uses
 * a tie-breaker to adjust the score based on remaining field matches
 */
PHRASE(MatchQuery.Type.PHRASE, 0.0f, new ParseField("phrase")),

/**
 * Uses the best matching phrase-prefix field as main score and uses
 * a tie-breaker to adjust the score based on remaining field matches
 */
PHRASE_PREFIX(MatchQuery.Type.PHRASE_PREFIX, 0.0f, new ParseField("phrase_prefix"));