Deprecation warning when creating interval patterns

Since wildcard index patterns now get the same performance optimizations
that interval patterns traditionally received while being more flexible
overall, interval based index patterns are no longer needed. For now, we
simply present users with a notice that interval-based patterns are now
deprecated, though we don't stop them from creating them.

src/plugins/kibana/public/settings/sections/indices/_create.html

@@ -19,11 +19,25 @@ <h1>Configure an index pattern</h1>
             <br>
             <label ng-if="index.isTimeBased">
               <input ng-model="index.nameIsPattern" type="checkbox">
-              Use event times to create index names
+              Use event times to create index names <small>[DEPRECATED]</small>
             </label>
           </div>
 
           <div class="form-group" ng-if="index.isTimeBased && index.nameIsPattern">
+            <div class="alert alert-warning">
+              <h4>Time-interval based index patterns are deprecated!</h4>
+              <p>
+                We <strong>strongly recommend</strong> using wildcard pattern names instead of
+                time-interval based index patterns.
+              </p>
+              <p>
+                Kibana is now smart enough to automatically determine which
+                indices to search against within the current time range for
+                wildcard index patterns. This means that wildcard
+                index patterns now get the same performance optimizations when
+                searching within a time range as time-interval patterns.
+              </p>
+            </div>
             <label>
               Index pattern interval&nbsp;
               <kbn-info info="The interval at which index names rotate."></kbn-info>