You can use the search endpoint to retrieve search results for any text-based query with filtering options for type of application, groups, etc. When a custom document is displayed it will also include a SearchFields node containing some special fields and any custom fields you have added to the index.

See Example search queries for specific examples of endpoint urls to limit results using filters.

EndpointGETapi.ashx/v2/search.xml (or .json)
RequestSearchResultListRequest
Query Optional Query is not required but you should use either Query or Filters otherwise you'll get all documents in the search index.
Filters Optional Filters is not required but you should use either Query or Filters otherwise you'll get all documents in the search index.
Sort Optional Two options for sort are titlesort and date and it also supports asc and desc. To sort by title ascending use sort=titlesort+asc, to sort by date descending use sort=date+desc.
StartDate Optional StartDate
EndDate Optional EndDate
Collapse Optional Result collapsing will default to true if not specified.
FieldFacets Optional FieldFacets
DateRangeFacets Optional DateRangeFacets
FieldFilters Optional FieldFilters
DateRangeFilters Optional DateRangeFilters
Tags Optional Comma delimited list of tags.
LogicallyOrTags Optional Whether to AND or OR tags specified in the Tags parameter. Default is False, logically AND tags.
PageSize Optional Specify the number of results to return per page. If not set the default is 20. The max is 100.
PageIndex Optional Specify the page number of paged results to return. Zero-based index. If not specified the default is 0.
Example (C#)
var webClient = new WebClient();

// replace the "admin" and "Admin's API key" with your valid user and apikey!
// http://telligent.com/community/developers/w/wiki/how-to-generate-an-api-key.aspx
var adminKey = String.Format("{0}:{1}", "Admin's API Key", "admin");
var adminKeyBase64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(adminKey));

webClient.Headers.Add("Rest-User-Token", adminKeyBase64);

var requestUrl = "http://mysite.com/api.ashx/v2/search.xml?query=sample"; // or .json
var xml = webClient.DownloadString(requestUrl);

Console.WriteLine(xml);
Example Response (XML)
<?xml version="1.0" encoding="utf-8"?>
<Response>
  <Info />
  <Warnings />
  <Errors />
  <SearchResults PageSize="20" PageIndex="0" TotalCount="2">
    <SearchResult>
      <Id>Telligent.Evolution.Wikis.Components.Wiki, Telligent.Evolution.Wikis|1</Id>
      <ContentId>1</ContentId>
      <Title>Sample Wiki</Title>
      <Url>http://localhost/tetest1/sample_group/w/sample_wiki/default.aspx</Url>
      <Date>2011-06-22T19:29:00-04:00</Date>
      <ContentType>wikiapp</ContentType>
      <Body />
      <BestMatch />
      <BestMatchTitle>Sample Wiki</BestMatchTitle>
      <SearchFields>
        <category>wiki</category>
      </SearchFields>
      <SectionId />
      <ThreadId />
      <WikiId>1</WikiId>
      <Group>
        <Id>3</Id>
        <AvatarUrl>http://mysite.com/utility/defaulthub.gif</AvatarUrl>
        <DateCreated>2011-01-17T10:00:58.133</DateCreated>
        <Description />
        <Key>sample_group</Key>
        <Name>Sample Group</Name>
        <ParentGroupId>1</ParentGroupId>
        <Url>http://mysite.com/sample_group/default.aspx</Url>
        <TotalMembers>0</TotalMembers>
        <HasGroups>true</HasGroups>
        <GroupCount>2</GroupCount>
        <GroupType>Joinless</GroupType>
        <EnableGroupMessages>true</EnableGroupMessages>
        <EnableContact>false</EnableContact>
        <SearchUniqueId>Telligent.Evolution.Components.Group, Telligent.Evolution.Components|3</SearchUniqueId>
        <ExtendedAttributes />
      </Group>
      <IndexedAt>2011-06-22T15:40:00.465-04:00</IndexedAt>
    </SearchResult>
    <SearchResult>
      <Id>Telligent.Evolution.MediaGalleries.Components.MediaGallery, Telligent.Evolution.MediaGalleries|1</Id>
      <ContentId>1</ContentId>
      <Title>Sample Media</Title>
      <Url>http://localhost/tetest1/sample_group/m/samplemedia/default.aspx</Url>
      <Date>2011-06-22T15:29:00-04:00</Date>
      <ContentType>fileapp</ContentType>
      <Body />
      <BestMatch />
      <BestMatchTitle>Sample Media</BestMatchTitle>
      <SearchFields>
        <category>file</category>
      </SearchFields>
      <SectionId>1</SectionId>
      <ThreadId />
      <WikiId />
      <Group>
        <Id>3</Id>
        <AvatarUrl>http://mysite.com/utility/defaulthub.gif</AvatarUrl>
        <DateCreated>2011-01-17T10:00:58.133</DateCreated>
        <Description />
        <Key>sample_group</Key>
        <Name>Sample Group</Name>
        <ParentGroupId>1</ParentGroupId>
        <Url>http://mysite.com/sample_group/default.aspx</Url>
        <TotalMembers>0</TotalMembers>
        <HasGroups>true</HasGroups>
        <GroupCount>2</GroupCount>
        <GroupType>Joinless</GroupType>
        <EnableGroupMessages>true</EnableGroupMessages>
        <EnableContact>false</EnableContact>
        <SearchUniqueId>Telligent.Evolution.Components.Group, Telligent.Evolution.Components|3</SearchUniqueId>
        <ExtendedAttributes />
      </Group>
      <IndexedAt>2011-06-22T15:40:01.536-04:00</IndexedAt>
    </SearchResult>   
  </SearchResults>
</Response>
Example Response (JSON)
{
  "PageSize": 20,
  "PageIndex": 0,
  "TotalCount": 2,
  "SearchResults": [
    {
      "Id": "Telligent.Evolution.Wikis.Components.Wiki, Telligent.Evolution.Wikis|1",
      "ContentId": "1",
      "Title": "Sample Wiki",
      "Url": "http://localhost/tetest1/sample_group/w/sample_wiki/default.aspx",
      "Date": "2011-06-22T19:29:00-04:00",
      "ContentType": "wikiapp",
      "Body": "",
      "BestMatch": "",
      "BestMatchTitle": "Sample Wiki",
      "SearchFields": [
        {
          "Name": "category",
          "Value": "wiki"

        }
      ],
      "SectionId": null,
      "ThreadId": null,
      "WikiId": 1,
      "Tags": null,
      "Group": {
        "AvatarUrl": "http://mysite.com/utility/defaulthub.gif",
        "DateCreated": "2011-01-17T10:00:58.133",
        "Description": "",
        "Key": "sample_group",
        "Name": "Sample Group",
        "ParentGroupId": 1,
        "Url": "http://mysite.com/sample_group/default.aspx",
        "TotalMembers": 0,
        "HasGroups": true,
        "GroupCount": 2,
        "GroupType": 0,
        "EnableGroupMessages": true,
        "EnableContact": false,
        "SearchUniqueId": "Telligent.Evolution.Components.Group, Telligent.Evolution.Components|3",
        "ExtendedAttributes": [],
        "Id": 3
      },
      "Users": null,
      "IndexedAt": "2011-06-22T15:40:00.465-04:00"

    },
    {
      "Id": "Telligent.Evolution.MediaGalleries.Components.MediaGallery, Telligent.Evolution.MediaGalleries|1",
      "ContentId": "1",
      "Title": "Sample Media",
      "Url": "http://localhost/tetest1/sample_group/m/samplemedia/default.aspx",
      "Date": "2011-06-22T15:29:00-04:00",
      "ContentType": "fileapp",
      "Body": "",
      "BestMatch": "",
      "BestMatchTitle": "Sample Media",
      "SearchFields": [
        {
          "Name": "category",
          "Value": "file"

        }
      ],
      "SectionId": 1,
      "ThreadId": null,
      "WikiId": null,
      "Tags": null,
      "Group": {
        "AvatarUrl": "http://mysite.com/utility/defaulthub.gif",
        "DateCreated": "2011-01-17T10:00:58.133",
        "Description": "",
        "Key": "sample_group",
        "Name": "Sample Group",
        "ParentGroupId": 1,
        "Url": "http://mysite.com/sample_group/default.aspx",
        "TotalMembers": 0,
        "HasGroups": true,
        "GroupCount": 2,
        "GroupType": 0,
        "EnableGroupMessages": true,
        "EnableContact": false,
        "SearchUniqueId": "Telligent.Evolution.Components.Group, Telligent.Evolution.Components|3",
        "ExtendedAttributes": [],
        "Id": 3
      },
      "Users": null,
      "IndexedAt": "2011-06-22T15:40:01.536-04:00"

    }
  ],
  "Info": [],
  "Warnings": [],
  "Errors": []
}