Solr auto suggest (suggester) returns no results - solr

Question

I am quite new to using solr5.1 - and I am now playing around to see if I can get the autosuggest to work. So, the background is that I have a core named docs and I post documents to this collection using something along the lines of:
/bin/post -c docs /path/to/my/docs/*.pdf
..and I have the documents indexed. Now, I tweak the solrconfig.xml, located within my core directory to include autosuggest. So, borrowing some code from here, I include the following:
<searchComponent name="suggest" class="solr.SuggestComponent">
<lst name="suggester">
<str name="name">mySuggester</str>
<str name="lookupImpl">FuzzyLookupFactory</str>
<str name="storeDir">suggester_fuzzy_dir</str>
<!-- Substitute these for the two above for another "flavor"
<str name=”lookupImpl”>AnalyzingInfixLookupFactory</str>
<str name=”indexPath”>suggester_infix_dir</str>
-->
<str name="dictionaryImpl">DocumentDictionaryFactory</str>
<str name="field">_text_</str>
<str name="suggestAnalyzerFieldType">string</str>
<str name="buildOnStartup">false</str>
<str name="buildOnCommit">false</str>
</lst>
</searchComponent>
<requestHandler name="/suggest" class="solr.SearchHandler" startup="lazy" >
<lst name="defaults">
<str name="suggest">true</str>
<str name="suggest.count">10</str>
<str name="suggest.dictionary">mySuggester</str>
</lst>
<arr name="components">
<str>suggest</str>
</arr>
</requestHandler>
Now, I do:
http://localhost:8983/solr/docs/suggest?suggest=true&suggest.build=true&suggest.dictionary=mySuggester&wt=json&suggest.q=mode
and I always seem to get:
{"responseHeader":
{"status":0,"QTime":19},
"command":"build","suggest":
{"mySuggester":
{"mode":
{"numFound":0,"suggestions":[]}
}
}
}
I am not entirely sure what is it that I am doing wrong - I was wondering if I should be modifying the solrconfig.xml before adding any docs? or was it something wrong with the snippet of code inserted into it? Also, I am not sure if this line:
<str name="suggestAnalyzerFieldType">string</str>
is correct. I read that use of string should not be used - but again, I see the solr docs using it.
I have also tried code from here, but it seems to give me the same results - i.e no suggested words.
Any help on this would be great.
UPDATE: #01:
I have recently been reading that some features of solr need stored=true to work. I am now wondering if this applies to Suggester. So, do I need to turn the text field in solr.xml to stored=true?