How to use Solr Suggester ContextField with boolean field - solr

Question

I am using Solr 6.0.0
I am tring to filter out unwanted suggestions from Solr Suggester. In my Solr database I have all my products
My products all have a boolean field "ShowOnSite". Products that are ready for sale have this value set to true. Products not yet ready have it set to false.
When I try to filter the suggested results from the suggester using this boolean field, I always get 0 results, even though I have plenty of products ready to be shown.
My Products looks somewhat like this like this:
<field name="id" type="string" indexed="true" stored="true" required="true"/>
<field name="Name" type="string" indexed="true" stored="true"/>
<field name="ShowOnSite" type="boolean" indexed="true" stored="true" />
<field name="text_autocomplete" type="textSuggest" indexed="true" stored="true"/>
The textSuggest fieldType has the following configuration:
<fieldType class="solr.TextField" name="textSuggest" positionIncrementGap="100">
<analyzer>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StandardFilterFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>
My suggester looks like this
<requestHandler name="/suggest" class="solr.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="suggest">true</str>
<str name="suggest.count">20</str>
<str name="wt">json</str>
</lst>
<arr name="components">
<str>suggest</str>
</arr>
</requestHandler>
<searchComponent name="suggest" class="solr.SuggestComponent">
<lst name="suggester">
<str name="name">default</str>
<str name="lookupImpl">AnalyzingInfixLookupFactory</str>
<str name="highlight">true</str>
<str name="dictionaryImpl">DocumentDictionaryFactory</str>
<str name="field">text_autocomplete</str>
<str name="weightField">InStock</str>
<str name="contextField">ShowOnSite</str>
<str name="suggestAnalyzerFieldType">textSuggest</str>
<str name="buildOnStartup">true</str>
</lst>
</searchComponent>
My query looks like this:
/suggest?suggest.q={querystring}&suggest.cfq=true
Expected
I receive only the products that has "ShowOnSite" == true
Actual
I receive 0 proucts from the suggester
I have tried other configurations aswell. By using not true I get all products:
/suggest?suggest.q={querystring}&suggest.cfq=-true
I have also tried to add the field name in the cfq. This yields 0 products:
/suggest?suggest.q={querystring}&suggest.cfq=ShowOnSite:true
EDIT1
I have also tried using either 0 or 1 for false and true respectively. These do not work either

Answer 1

Initial guess is that this is caused by the boolean type of the field, since no analysis happens as far as I know for the values used by the cfq.
Make a secondary field as a string field and store the false or true value verbatim in that field - and use that for filtering instead.

Answer 2

As suggested by MatsLindh. Use a text field instead.
The easiest way is to just copy that field:
Add this to the managed-schema file of your index (in Solr):
<field name="THE_FIELD_TO_BE_USED_BY_THE_SUGGESTER" type="text_general" indexed="true" stored="true" multiValued="false"/>
<copyField source="YOUR_BOOLEAN_FIELD" dest="THE_FIELD_TO_BE_USED_BY_THE_SUGGESTER" maxChars="30000" />