Adds OpenSearch Intelligent Ranking plugin (#2012)

* Adds OpenSearch Intelligent Ranking plugin

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Updated images

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Changed link reference

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Changed image for compare search results

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Implemented PM feedback

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* More PM comments

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Fixed typo

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Rolled back Kendra changes

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

_search-plugins/search-relevance/index.md

@@ -49,7 +49,7 @@ The following is an example query:
   "query": {
     "multi_match": {
       "query": "%SearchText%",
-      "fields": [ "title", "text" ]
+      "fields": [ "description", "item_name" ]
     }
   }
 }
@@ -64,7 +64,7 @@ The following example query boosts the `title` field in search results:
   "query": {
     "multi_match": {
       "query": "%SearchText%",
-      "fields": [ "title^3", "text" ]
+      "fields": [ "description", "item_name^3" ]
     }
   }
 }
@@ -72,11 +72,11 @@ The following example query boosts the `title` field in search results:
 
 **Step 5:** Select **Search** and compare the results in **Result 1** and **Result 2**.
 
-The following example screen shows a search for the word "container" in the `title` and `text` fields with and without boosting the `title`:
+The following example screen shows a search for the word "cup" in the `description` and `item_name` fields with and without boosting the `item_name`:
 
 <img src="{{site.url}}{{site.baseurl}}/images/search_relevance.png" alt="Compare search results"/>{: .img-fluid }
 
-If a result in Result 1 appears in Result 2, the `Up` and `Down` indicators below the result number signify how many places the result moved up or down compared to the same result in Result 2. In this example, the document with the ID 10 is `Up 1` place in Result 2 compared to Result 1 and `Down 1` place in Result 1 compared to Result 2. 
+If a result in Result 1 appears in Result 2, the `Up` and `Down` indicators below the result number signify how many places the result moved up or down compared to the same result in Result 2. In this example, the document with the ID 2 is `Up 1` place in Result 2 compared to Result 1 and `Down 1` place in Result 1 compared to Result 2. 
 
 ## Changing the number of results