Issue search support elasticsearch (#9428)

* Issue search support elasticsearch

* Fix lint

* Add indexer name on app.ini

* add a warnning on SearchIssuesByKeyword

* improve code

vendor/github.com/olivere/elastic/v7/search_queries_match.go

@@ -0,0 +1,189 @@
+// Copyright 2012-present Oliver Eilhard. All rights reserved.
+// Use of this source code is governed by a MIT-license.
+// See http://olivere.mit-license.org/license.txt for details.
+
+package elastic
+
+// MatchQuery is a family of queries that accepts text/numerics/dates,
+// analyzes them, and constructs a query.
+//
+// To create a new MatchQuery, use NewMatchQuery. To create specific types
+// of queries, e.g. a match_phrase query, use NewMatchPhrQuery(...).Type("phrase"),
+// or use one of the shortcuts e.g. NewMatchPhraseQuery(...).
+//
+// For more details, see
+// https://www.elastic.co/guide/en/elasticsearch/reference/7.0/query-dsl-match-query.html
+type MatchQuery struct {
+	name                string
+	text                interface{}
+	operator            string // or / and
+	analyzer            string
+	boost               *float64
+	fuzziness           string
+	prefixLength        *int
+	maxExpansions       *int
+	minimumShouldMatch  string
+	fuzzyRewrite        string
+	lenient             *bool
+	fuzzyTranspositions *bool
+	zeroTermsQuery      string
+	cutoffFrequency     *float64
+	queryName           string
+}
+
+// NewMatchQuery creates and initializes a new MatchQuery.
+func NewMatchQuery(name string, text interface{}) *MatchQuery {
+	return &MatchQuery{name: name, text: text}
+}
+
+// Operator sets the operator to use when using a boolean query.
+// Can be "AND" or "OR" (default).
+func (q *MatchQuery) Operator(operator string) *MatchQuery {
+	q.operator = operator
+	return q
+}
+
+// Analyzer explicitly sets the analyzer to use. It defaults to use explicit
+// mapping config for the field, or, if not set, the default search analyzer.
+func (q *MatchQuery) Analyzer(analyzer string) *MatchQuery {
+	q.analyzer = analyzer
+	return q
+}
+
+// Fuzziness sets the fuzziness when evaluated to a fuzzy query type.
+// Defaults to "AUTO".
+func (q *MatchQuery) Fuzziness(fuzziness string) *MatchQuery {
+	q.fuzziness = fuzziness
+	return q
+}
+
+// PrefixLength sets the length of a length of common (non-fuzzy)
+// prefix for fuzzy match queries. It must be non-negative.
+func (q *MatchQuery) PrefixLength(prefixLength int) *MatchQuery {
+	q.prefixLength = &prefixLength
+	return q
+}
+
+// MaxExpansions is used with fuzzy or prefix type queries. It specifies
+// the number of term expansions to use. It defaults to unbounded so that
+// its recommended to set it to a reasonable value for faster execution.
+func (q *MatchQuery) MaxExpansions(maxExpansions int) *MatchQuery {
+	q.maxExpansions = &maxExpansions
+	return q
+}
+
+// CutoffFrequency can be a value in [0..1] (or an absolute number >=1).
+// It represents the maximum treshold of a terms document frequency to be
+// considered a low frequency term.
+func (q *MatchQuery) CutoffFrequency(cutoff float64) *MatchQuery {
+	q.cutoffFrequency = &cutoff
+	return q
+}
+
+// MinimumShouldMatch sets the optional minimumShouldMatch value to
+// apply to the query.
+func (q *MatchQuery) MinimumShouldMatch(minimumShouldMatch string) *MatchQuery {
+	q.minimumShouldMatch = minimumShouldMatch
+	return q
+}
+
+// FuzzyRewrite sets the fuzzy_rewrite parameter controlling how the
+// fuzzy query will get rewritten.
+func (q *MatchQuery) FuzzyRewrite(fuzzyRewrite string) *MatchQuery {
+	q.fuzzyRewrite = fuzzyRewrite
+	return q
+}
+
+// FuzzyTranspositions sets whether transpositions are supported in
+// fuzzy queries.
+//
+// The default metric used by fuzzy queries to determine a match is
+// the Damerau-Levenshtein distance formula which supports transpositions.
+// Setting transposition to false will
+// * switch to classic Levenshtein distance.
+// * If not set, Damerau-Levenshtein distance metric will be used.
+func (q *MatchQuery) FuzzyTranspositions(fuzzyTranspositions bool) *MatchQuery {
+	q.fuzzyTranspositions = &fuzzyTranspositions
+	return q
+}
+
+// Lenient specifies whether format based failures will be ignored.
+func (q *MatchQuery) Lenient(lenient bool) *MatchQuery {
+	q.lenient = &lenient
+	return q
+}
+
+// ZeroTermsQuery can be "all" or "none".
+func (q *MatchQuery) ZeroTermsQuery(zeroTermsQuery string) *MatchQuery {
+	q.zeroTermsQuery = zeroTermsQuery
+	return q
+}
+
+// Boost sets the boost to apply to this query.
+func (q *MatchQuery) Boost(boost float64) *MatchQuery {
+	q.boost = &boost
+	return q
+}
+
+// QueryName sets the query name for the filter that can be used when
+// searching for matched filters per hit.
+func (q *MatchQuery) QueryName(queryName string) *MatchQuery {
+	q.queryName = queryName
+	return q
+}
+
+// Source returns JSON for the function score query.
+func (q *MatchQuery) Source() (interface{}, error) {
+	// {"match":{"name":{"query":"value","type":"boolean/phrase"}}}
+	source := make(map[string]interface{})
+
+	match := make(map[string]interface{})
+	source["match"] = match
+
+	query := make(map[string]interface{})
+	match[q.name] = query
+
+	query["query"] = q.text
+
+	if q.operator != "" {
+		query["operator"] = q.operator
+	}
+	if q.analyzer != "" {
+		query["analyzer"] = q.analyzer
+	}
+	if q.fuzziness != "" {
+		query["fuzziness"] = q.fuzziness
+	}
+	if q.prefixLength != nil {
+		query["prefix_length"] = *q.prefixLength
+	}
+	if q.maxExpansions != nil {
+		query["max_expansions"] = *q.maxExpansions
+	}
+	if q.minimumShouldMatch != "" {
+		query["minimum_should_match"] = q.minimumShouldMatch
+	}
+	if q.fuzzyRewrite != "" {
+		query["fuzzy_rewrite"] = q.fuzzyRewrite
+	}
+	if q.lenient != nil {
+		query["lenient"] = *q.lenient
+	}
+	if q.fuzzyTranspositions != nil {
+		query["fuzzy_transpositions"] = *q.fuzzyTranspositions
+	}
+	if q.zeroTermsQuery != "" {
+		query["zero_terms_query"] = q.zeroTermsQuery
+	}
+	if q.cutoffFrequency != nil {
+		query["cutoff_frequency"] = *q.cutoffFrequency
+	}
+	if q.boost != nil {
+		query["boost"] = *q.boost
+	}
+	if q.queryName != "" {
+		query["_name"] = q.queryName
+	}
+
+	return source, nil
+}