Is Solr SuggestComponent able to return shingles instead of whole field values? - solr

Question

I use solr 5.0.0 and want to create an autocomplete functionality generating suggestions from the word-grams (or shingles) of my documents.
The problem is that in return of a suggest-query I only get complete "terms" of the search field which can be extremly long.
CURRENT PROBLEM:
Input:"so"
Suggestions:
"......extremly long text son long text continuing......"
"......next long text solar next text continuing......"
GOAL:
Input: "so"
Suggestions with shingles:
"son"
"solar"
"solar test"
etc
<searchComponent name="suggest" class="solr.SuggestComponent"
enable="${solr.suggester.enabled:true}" >
<lst name="suggester">
<str name="name">mySuggester</str>
<str name="lookupImpl">AnalyzingInfixLookupFactory</str>
<str name="dictionaryImpl">DocumentDictionaryFactory</str>
<str name="field">title_and_description_suggest</str>
<str name="weightField">price</str>
<str name="suggestAnalyzerFieldType">autocomplete</str>
<str name="queryAnalyzerFieldType">autocomplete</str>
<str name="buildOnCommit">true</str>
</lst>
schema.xml:
<fieldType name="autocomplete" class="solr.TextField" positionIncrementGap="100">
<analyzer>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="lang/stopwords_de.txt" format="snowball"/>
<filter class="solr.ShingleFilterFactory" maxShingleSize="2" outputUnigrams="true" outputUnigramsIfNoShingles="true"/>
<filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
</analyzer>
</fieldType>
I want to return max 3 words as autocomplete term. Is this possible with the SuggestComponent or how would you do it? No matter what I try I always receive the complete field value of matching documents.
Is that expected behaviour or what did I do wrong?
Many thanks in advance

Answer 1

In schema.xml define fieldType as follows:
<fieldType name="text_autocomplete" class="solr.TextField" positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.ShingleFilterFactory" minShingleSize="2" maxShingleSize="5"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.KeywordTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>
In schema.xml define your field as follows:
<field name="example_field" type="text_autocomplete" indexed="true" stored="true"/>
Write your query as follows:
query?q=*&
rows=0&
facet=true&
facet.field=example_field&
facet.limit=-1&
wt=json&
indent=true&
facet.prefix=so
In the facet.prefix field, specify the term being searched for which you want suggestions ('so', in this example). If you need less than 5 words in the suggestion, reduce maxShingleSize in the fieldType definition accordingly. By default, you will get the results in decreasing order of their frequency of occurrence.