Token based Related Conversation

[westei]

We need a QueryProvider that supports to suggest related Conversation based on Removed/Added Tokens of the User.

The current SolrMLT based solution does not allow for this and for using the ConversationQueryBuilder the conversation service needs to support uploading modified Analysis (with updated Tokens based on User Interactions with the Widget).

This will also require a configuration change for existing Clients if we move away from the Solr MLT to a Token based implementation.

[westei]

Server side implementation is more or less complete. Widget support is pending (hence assiging to @Peym4n )

The query is based on the related.conversation template. Here is an example Query

{
      "_class" : "io.redlink.smarti.query.conversation.ConversationSearchQuery",
      "creator" : "queryBuilder:conversationsearch:conversationsearch",
      "displayTitle" : "Conversationen zum Thema [Request, Facets, Solr Query, einfachen Parameter, `facet.limit` parameter, Anzahl, schau, Sagen]",
      "confidence" : 0.6,
      "url" : null,
      "inlineResultSupport" : false,
      "created" : 1517574598824,
      "state" : "Suggested",
      "defaults" : {
        "hl" : "true",
        "fl" : "id,message_id,meta_channel_id,user_id,time,message,type",
        "sort" : "time desc",
        "hl.fl" : "message",
        "rows" : 3
      },
      "keywords" : [ "Request", "Facets", "Solr Query", "einfachen Parameter", "`facet.limit` parameter", "Anzahl", "schau", "Sagen" ],
      "queryParams" : [ ],
      "filterQueries" : [ "-meta_support_area:*" ]
    }

Notes:

• The url is not yet set, but this is expected to do a GET /conversation/search-message
• filterQueries are set based on the configured meta fields and context information of the conversation (similar to the SolrMLT)
• configuration supports setting the defaults

[mrsimpson]

Created #212 as a minor left-over