Refactor completion suggester to accept regex/prefix and options

The completion suggester now supports regex/prefix and their options.

The FuzzyCompletionSuggester is removed as it can be completely
implemented with CompletionSuggester now.

.travis.yml

@@ -12,4 +12,4 @@ services:
   - docker
 before_install:
   - sudo sysctl -w vm.max_map_count=262144
-  - docker run -d --rm -p 9200:9200  -e "http.host=0.0.0.0" -e "transport.host=127.0.0.1" -e "bootstrap.memory_lock=true" -e "ES_JAVA_OPTS=-Xms1g -Xmx1g" docker.elastic.co/elasticsearch/elasticsearch:6.0.0 elasticsearch -Expack.security.enabled=false -Enetwork.host=_local_,_site_ -Enetwork.publish_host=_local_
+  - docker run -d --rm -p 9200:9200  -e "http.host=0.0.0.0" -e "transport.host=127.0.0.1" -e "bootstrap.memory_lock=true" -e "ES_JAVA_OPTS=-Xms1g -Xmx1g" docker.elastic.co/elasticsearch/elasticsearch:6.1.1 elasticsearch -Expack.security.enabled=false -Enetwork.host=_local_,_site_ -Enetwork.publish_host=_local_

CONTRIBUTORS

@@ -84,6 +84,7 @@ Marcy Buccellato [@marcybuccellato](https://github.com/marcybuccellato)
 Mark Costello [@mcos](https://github.com/mcos)
 Martin Häger [@protomouse](https://github.com/protomouse)
 Medhi Bechina [@mdzor](https://github.com/mdzor)
+mnpritula [@mnpritula](https://github.com/mnpritula)
 mosa [@mosasiru](https://github.com/mosasiru)
 naimulhaider [@naimulhaider](https://github.com/naimulhaider)
 Naoya Yoshizawa [@azihsoyn](https://github.com/azihsoyn)

client.go

@@ -26,7 +26,7 @@ import (
 
 const (
 	// Version is the current version of Elastic.
-	Version = "6.0.0"
+	Version = "6.1.0"
 
 	// DefaultURL is the default endpoint of Elasticsearch on the local machine.
 	// It is used e.g. when initializing a new Client without a specific URL.

run-es.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
-VERSION=${VERSION:=6.0.0}
+VERSION=${VERSION:=6.1.1}
 docker run --rm -p 9200:9200  -e "http.host=0.0.0.0" -e "transport.host=127.0.0.1" -e "bootstrap.memory_lock=true" -e "ES_JAVA_OPTS=-Xms1g -Xmx1g" docker.elastic.co/elasticsearch/elasticsearch:$VERSION elasticsearch -Expack.security.enabled=false -Enetwork.host=_local_,_site_ -Enetwork.publish_host=_local_

suggester_completion.go

@@ -7,24 +7,30 @@ package elastic
 import "errors"
 
 // CompletionSuggester is a fast suggester for e.g. type-ahead completion.
-// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/search-suggesters-completion.html
+// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/search-suggesters-completion.html
 // for more details.
 type CompletionSuggester struct {
 	Suggester
 	name           string
 	text           string
+	prefix         string
+	regex          string
 	field          string
 	analyzer       string
 	size           *int
 	shardSize      *int
 	contextQueries []SuggesterContextQuery
+	payload        interface{}
+
+	fuzzyOptions   *FuzzyCompletionSuggesterOptions
+	regexOptions   *RegexCompletionSuggesterOptions
+	skipDuplicates *bool
 }
 
 // Creates a new completion suggester.
 func NewCompletionSuggester(name string) *CompletionSuggester {
 	return &CompletionSuggester{
-		name:           name,
-		contextQueries: make([]SuggesterContextQuery, 0),
+		name: name,
 	}
 }
 
@@ -37,6 +43,57 @@ func (q *CompletionSuggester) Text(text string) *CompletionSuggester {
 	return q
 }
 
+func (q *CompletionSuggester) Prefix(prefix string) *CompletionSuggester {
+	q.prefix = prefix
+	return q
+}
+
+func (q *CompletionSuggester) PrefixWithEditDistance(prefix string, editDistance interface{}) *CompletionSuggester {
+	q.prefix = prefix
+	q.fuzzyOptions = NewFuzzyCompletionSuggesterOptions().EditDistance(editDistance)
+	return q
+}
+
+func (q *CompletionSuggester) PrefixWithOptions(prefix string, options *FuzzyCompletionSuggesterOptions) *CompletionSuggester {
+	q.prefix = prefix
+	q.fuzzyOptions = options
+	return q
+}
+
+func (q *CompletionSuggester) FuzzyOptions(options *FuzzyCompletionSuggesterOptions) *CompletionSuggester {
+	q.fuzzyOptions = options
+	return q
+}
+
+func (q *CompletionSuggester) Fuzziness(fuzziness interface{}) *CompletionSuggester {
+	if q.fuzzyOptions == nil {
+		q.fuzzyOptions = NewFuzzyCompletionSuggesterOptions()
+	}
+	q.fuzzyOptions = q.fuzzyOptions.EditDistance(fuzziness)
+	return q
+}
+
+func (q *CompletionSuggester) Regex(regex string) *CompletionSuggester {
+	q.regex = regex
+	return q
+}
+
+func (q *CompletionSuggester) RegexWithOptions(regex string, options *RegexCompletionSuggesterOptions) *CompletionSuggester {
+	q.regex = regex
+	q.regexOptions = options
+	return q
+}
+
+func (q *CompletionSuggester) RegexOptions(options *RegexCompletionSuggesterOptions) *CompletionSuggester {
+	q.regexOptions = options
+	return q
+}
+
+func (q *CompletionSuggester) SkipDuplicates(skipDuplicates bool) *CompletionSuggester {
+	q.skipDuplicates = &skipDuplicates
+	return q
+}
+
 func (q *CompletionSuggester) Field(field string) *CompletionSuggester {
 	q.field = field
 	return q
@@ -72,17 +129,25 @@ func (q *CompletionSuggester) ContextQueries(queries ...SuggesterContextQuery) *
 // We got into trouble when using plain maps because the text element
 // needs to go before the completion element.
 type completionSuggesterRequest struct {
-	Text       string      `json:"text"`
-	Completion interface{} `json:"completion"`
+	Text       string      `json:"text,omitempty"`
+	Prefix     string      `json:"prefix,omitempty"`
+	Regex      string      `json:"regex,omitempty"`
+	Completion interface{} `json:"completion,omitempty"`
 }
 
-// Creates the source for the completion suggester.
+// Source creates the JSON data for the completion suggester.
 func (q *CompletionSuggester) Source(includeName bool) (interface{}, error) {
 	cs := &completionSuggesterRequest{}
 
 	if q.text != "" {
 		cs.Text = q.text
 	}
+	if q.prefix != "" {
+		cs.Prefix = q.prefix
+	}
+	if q.regex != "" {
+		cs.Regex = q.regex
+	}
 
 	suggester := make(map[string]interface{})
 	cs.Completion = suggester
@@ -126,6 +191,28 @@ func (q *CompletionSuggester) Source(includeName bool) (interface{}, error) {
 		suggester["contexts"] = ctxq
 	}
 
+	// Fuzzy options
+	if q.fuzzyOptions != nil {
+		src, err := q.fuzzyOptions.Source()
+		if err != nil {
+			return nil, err
+		}
+		suggester["fuzzy"] = src
+	}
+
+	// Regex options
+	if q.regexOptions != nil {
+		src, err := q.regexOptions.Source()
+		if err != nil {
+			return nil, err
+		}
+		suggester["regex"] = src
+	}
+
+	if q.skipDuplicates != nil {
+		suggester["skip_duplicates"] = *q.skipDuplicates
+	}
+
 	// TODO(oe) Add completion-suggester specific parameters here
 
 	if !includeName {
@@ -136,3 +223,130 @@ func (q *CompletionSuggester) Source(includeName bool) (interface{}, error) {
 	source[q.name] = cs
 	return source, nil
 }
+
+// -- Fuzzy options --
+
+// FuzzyCompletionSuggesterOptions represents the options for fuzzy completion suggester.
+type FuzzyCompletionSuggesterOptions struct {
+	editDistance          interface{}
+	transpositions        *bool
+	minLength             *int
+	prefixLength          *int
+	unicodeAware          *bool
+	maxDeterminizedStates *int
+}
+
+// NewFuzzyCompletionSuggesterOptions initializes a new FuzzyCompletionSuggesterOptions instance.
+func NewFuzzyCompletionSuggesterOptions() *FuzzyCompletionSuggesterOptions {
+	return &FuzzyCompletionSuggesterOptions{}
+}
+
+// EditDistance specifies the maximum number of edits, e.g. a number like "1" or "2"
+// or a string like "0..2" or ">5". See https://www.elastic.co/guide/en/elasticsearch/reference/5.6/common-options.html#fuzziness
+// for details.
+func (o *FuzzyCompletionSuggesterOptions) EditDistance(editDistance interface{}) *FuzzyCompletionSuggesterOptions {
+	o.editDistance = editDistance
+	return o
+}
+
+// Transpositions, if set to true, are counted as one change instead of two (defaults to true).
+func (o *FuzzyCompletionSuggesterOptions) Transpositions(transpositions bool) *FuzzyCompletionSuggesterOptions {
+	o.transpositions = &transpositions
+	return o
+}
+
+// MinLength represents the minimum length of the input before fuzzy suggestions are returned (defaults to 3).
+func (o *FuzzyCompletionSuggesterOptions) MinLength(minLength int) *FuzzyCompletionSuggesterOptions {
+	o.minLength = &minLength
+	return o
+}
+
+// PrefixLength represents the minimum length of the input, which is not checked for
+// fuzzy alternatives (defaults to 1).
+func (o *FuzzyCompletionSuggesterOptions) PrefixLength(prefixLength int) *FuzzyCompletionSuggesterOptions {
+	o.prefixLength = &prefixLength
+	return o
+}
+
+// UnicodeAware, if true, all measurements (like fuzzy edit distance, transpositions, and lengths)
+// are measured in Unicode code points instead of in bytes. This is slightly slower than
+// raw bytes, so it is set to false by default.
+func (o *FuzzyCompletionSuggesterOptions) UnicodeAware(unicodeAware bool) *FuzzyCompletionSuggesterOptions {
+	o.unicodeAware = &unicodeAware
+	return o
+}
+
+// MaxDeterminizedStates is currently undocumented in Elasticsearch. It represents
+// the maximum automaton states allowed for fuzzy expansion.
+func (o *FuzzyCompletionSuggesterOptions) MaxDeterminizedStates(max int) *FuzzyCompletionSuggesterOptions {
+	o.maxDeterminizedStates = &max
+	return o
+}
+
+// Source creates the JSON data.
+func (o *FuzzyCompletionSuggesterOptions) Source() (interface{}, error) {
+	out := make(map[string]interface{})
+
+	if o.editDistance != nil {
+		out["fuzziness"] = o.editDistance
+	}
+	if o.transpositions != nil {
+		out["transpositions"] = *o.transpositions
+	}
+	if o.minLength != nil {
+		out["min_length"] = *o.minLength
+	}
+	if o.prefixLength != nil {
+		out["prefix_length"] = *o.prefixLength
+	}
+	if o.unicodeAware != nil {
+		out["unicode_aware"] = *o.unicodeAware
+	}
+	if o.maxDeterminizedStates != nil {
+		out["max_determinized_states"] = *o.maxDeterminizedStates
+	}
+
+	return out, nil
+}
+
+// -- Regex options --
+
+// RegexCompletionSuggesterOptions represents the options for regex completion suggester.
+type RegexCompletionSuggesterOptions struct {
+	flags                 interface{} // string or int
+	maxDeterminizedStates *int
+}
+
+// NewRegexCompletionSuggesterOptions initializes a new RegexCompletionSuggesterOptions instance.
+func NewRegexCompletionSuggesterOptions() *RegexCompletionSuggesterOptions {
+	return &RegexCompletionSuggesterOptions{}
+}
+
+// Flags represents internal regex flags. See https://www.elastic.co/guide/en/elasticsearch/reference/5.6/search-suggesters-completion.html#regex
+// for details.
+func (o *RegexCompletionSuggesterOptions) Flags(flags interface{}) *RegexCompletionSuggesterOptions {
+	o.flags = flags
+	return o
+}
+
+// MaxDeterminizedStates represents the maximum automaton states allowed for regex expansion.
+// See https://www.elastic.co/guide/en/elasticsearch/reference/5.6/search-suggesters-completion.html#regex
+// for details.
+func (o *RegexCompletionSuggesterOptions) MaxDeterminizedStates(max int) *RegexCompletionSuggesterOptions {
+	o.maxDeterminizedStates = &max
+	return o
+}
+
+// Source creates the JSON data.
+func (o *RegexCompletionSuggesterOptions) Source() (interface{}, error) {
+	out := make(map[string]interface{})
+
+	if o.flags != nil {
+		out["flags"] = o.flags
+	}
+	if o.maxDeterminizedStates != nil {
+		out["max_determinized_states"] = *o.maxDeterminizedStates
+	}
+
+	return out, nil
+}