Email Search is one of the faceted search interfaces in SearchBlox v12.1 .
It is used to search email archives that have been indexed using an Email Collection.

To open the Email plugin, use this link in your build:
https://localhost:8443/email/index.html

Prerequisite

Please create an Email collection and then index the PST files.

Features of Email Plugin

You can search all emails by just typing your search terms.
You can also use faceted search with filters like From, To, Subject, and Date range.
All different fields are combined using AND, and if you enter multiple values in the same field, they are searched using OR.

Steps to use Email Plugin

After creating and indexing the collections, you can open the plugin using the link
https://localhost:8443/email/index.html
and perform searches to see the results as shown here:

Fields in facets.js

The content of facet.js are as shown:

window.facets = {
    "facets": [{
            "field": "colname",
            "display": "Collection Name",
            "size": "10"
        },
        {
            "field": "contenttype",
            "display": "File Type",
            "size": "10"
        },
        {
            "field": "keywords",
            "display": "keywords",
            "size": "10"
        },
        {
            "field": "lastmodified",
            "display": "Last Modified",
            "dateRange": [{
                    "name": "Last 24 hours",
                    "calendar": "days",
                    "value": "1"
                },
                {
                    "name": "Past Week",
                    "calendar": "days",
                    "value": "7"
                },
                {
                    "name": "Past Month",
                    "calendar": "months",
                    "value": "1"
                },
                {
                    "name": "Past Year",
                    "calendar": "years",
                    "value": "1"
                }
            ]
        }
    ],
    "collection": [],
    "sortBtns": [{
            "field": "lastmodified",
            "display": "Sort by date"
        },
        {
            "field": "relevance",
            "display": "Sort by relevance"
        }
    ],
    "facetFiltersOrder": [
      "colname","keywords"
    ],
    "facetFiltersType": "AND",
    "sortDir": "desc",
    "matchAny": "off",
    "pageSize": "10",
    "showAutoSuggest": "true",
    "defaultCname": "",
    "adsDisplay": "true",
    "featuredResultsCount": "3",
    "predictSearch": "false",
    "predictResultSize": "3",
    "customDateDisplayText":"Custom",
    "customDateEnable":"true",
    "relatedQuery": true,
    "relatedQueryFields": {
        "apikey": "",
        "field": "content",
        "operator": "and",
        "limit": "5",
        "terms": "10",
        "type": "phrase",
        "col": ""
    },
    "dataToBeDisplayed": {
        "1": {
            "title": "Title",
            "description": "Description"
        },
        "other": {
            "description": "Description"
        },
        "displayAll": true
    },
    "tune": {
        "enable": "true",
        "tune.0": "5",
        "tune.1": "3",
        "tune.2": "2",
        "tune.3": "5",
        "tune.4": "180",
        "tune.5": "10"
    },
    "defaultType": "",
    "pluginDomain": ""
};

If you want to use a meta field as a facet, you must add it in mapping.json. For CSV, database, MongoDB, and AWS collections, you must update the correct file: csv.json, jdbc.json, mongodb.json, or amazonS3.json, all located in ../webapps/ROOT/WEB-INF/.
If you want to add a number or date field as a facet, update it in mapping.json for web and file collections. For CSV, database, MongoDB, and AWS collections, update the same files: csv.json, jdbc.json, mongodb.json, and amazonS3.json in ../webapps/ROOT/WEB-INF/. ref: Custom Fields in Search

The description of the fields in the preceding js file is provided in the following table:

Field	Description
facets	Facets don’t work in tabbed search, so changing this won’t have any effect.
collection	Pick which collection numbers to use. You can add more than one by separating them with commas.
SortBtns	Add the “Sort By” options for sorting the results.
facetFiltersOrder	Decide the order in which the facet filters are shown.
sortDir	Choose the sort direction: ascending or descending.
pageSize	Set how many results should appear on each page.
showAutoSuggest	Turn the AutoSuggest feature on or off.
defaultCname	Choose the default collection to search first.
adsDisplay	Turn featured results (ads) on or off.
featuredResultsCount	Set how many featured results to show.
predictSearch	Turn on predicted search results.
predictResultSize	Set options for how many predicted search results to display.
customDateDisplayText	Change the label for the custom date filter.
customDateEnable	Turn the custom date filter on or off.
relatedQuery	Enable or disable related queries (default is true).
relatedQueryFields	If you want related queries in search results then specify the API key within the field. Also you can limit it based on collection by giving specific column number. "apikey": "BFC82BE93A351C018CB27C32E1138047", "field": "content", "operator": "and", "limit": "5", "terms": "10", "type": "phrase", "col": ""
dataToBeDisplayed	For CSV or database collections, list the fields to show in table format. If "displayAll": true, all fields are shown.
tune	Helps improve search relevancy. Enable by setting "enable": "true".
defaultType	Sets the search operator: AND or OR (default is OR).
pluginDomain	The SearchBlox domain from which the plugin should get search results.

🚧
Email Plugin especially the filters will work only with Email collection as from, to subject fields are fetched in Email collection alone.