ZEPPELIN-501 Notebook search

### What is this PR for?
This PR has for goal to allow the user to search through the code in all the paragraphs *and notebook names* in all the notebooks

It add a simple 'search bar' to the nav-bar of Zeppelin WebApp, and an in-memory fulltext search index of paragraphs to the backend.

The search is pretty basic now, fine-tuning it for better search over all types of source code will be a subject of further work.

### What type of PR is it?
Feature

### Todos
* [x] - Fix typos 💃 b853aa6
* [x] - fix js issue in js console felizbear 29da337
* [x] - update index on paragraph CRUD:
  - [x] Read (initial work)
  - [x] Create\Delete 825b266
  - [x] Update e915a69
  - [x] Delete paragraph
* [x] - add license to zeppelin-distribution/src/bin_license/LICENSE (backend for lucene, not sure about angular-resource as it is part of the AngularJS codebase, but will add just in case) c00b516
* [x] - add missing Apache headers ded9c3b felizbear 29da337
* [x] - fix CI (~~was failing RAT on zengine Too many files with unapproved license: 2~~, now flacky integration test AKA [ZEPPELIN-510](https://issues.apache.org/jira/browse/ZEPPELIN-510))
* [x] - index notebook names e80c3e5, felizbear 29da337
* [x] - make NotebookRepoSync.sync() package private again  5a18bc8
* [x] - NPE on persisting changes of existing notebook
* [x] - reduce log verbosity

### Is there a relevant Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-501

### How should this be tested?
Outline the steps to test the PR here.

### Screenshots (if appropriate)
![screen shot 2015-12-15 at 19 49 18](https://cloud.githubusercontent.com/assets/5582506/11808681/34d004e8-a365-11e5-9452-ea616029073c.png)

![screen shot 2015-12-15 at 19 52 03](https://cloud.githubusercontent.com/assets/5582506/11808699/5dc023ce-a365-11e5-953d-c23235446f9c.png)

### Questions:
* Does the licenses files need update? Yes, added to license files
* Is there breaking changes for older versions? No
* Does this needs documentation? Yes

This work is a collaboration with felizbear who contributed major parts of the frontend changes.

Author: Alexander Bezzubov <[email protected]>
Author: felizbear <[email protected]>
Author: Alexander <[email protected]>

Closes apache#534 from bzz/notebook-search and squashes the following commits:

c7f1d35 [Alexander Bezzubov] ZEPPELIN-501: refactoring, extract SearchService interface + Lucen-based impl
e3af25c [Alexander Bezzubov] ZEPPELIN-501: muting more search logs info->debug
c77d53b [Alexander Bezzubov] ZEPPELIN-501: fix + test for bug in index key structure
78f69a3 [Alexander Bezzubov] ZEPPELIN-501: update index on paragraph delete
73a28bb [Alexander Bezzubov] ZEPPELIN-501: fix NPE on Note creation by NotebookRepo, \wo DI constructor
cf44b1f [Alexander Bezzubov] ZEPPELIN-501: fix NPE on double-delete
d2b44ac [Alexander Bezzubov] ZEPPELIN-501: stop printing whole note in logs
f30e6c8 [Alexander Bezzubov] Merge branch 'master' into notebook-search
da69c07 [Alexander Bezzubov] ZEPPELIN-501: validate notes before update index
5f47890 [Alexander Bezzubov] ZEPPELIN-501: fix bug (merge artefact) that failed CI befor
e915a69 [Alexander Bezzubov] ZEPPELIN-501: update notebooks on save + tests
3f20904 [Alexander Bezzubov] ZEPPELIN-501: refactoring, compiler warning in Paragraph.java
40cf9e8 [Alexander Bezzubov] ZEPPELIN-501: refactoring, cleaning compiler warnings in Notebook.java
6a3906f [Alexander Bezzubov] Merge branch 'master' into notebook-search
2b2f8dc [Alexander Bezzubov] Merge branch 'master' into notebook-search
44235eb [Alexander Bezzubov] ZEPPELIN-501: refactoring, cleaning compiler warnings in Note.java
eb7878a [Alexander Bezzubov] Merge branch 'master' into notebook-search
0ce8a92 [Alexander Bezzubov] ZEPPELIN-501: add missing logger
6da1dc9 [Alexander Bezzubov] Merge branch 'master' into notebook-search
8c0f29a [Alexander Bezzubov] ZEPPELIN-501: fixing NPE in tests \w mocks
825b266 [Alexander Bezzubov] ZEPPELIN-501: refactoring + handling index Create\Delete
b13d5fb [Alexander Bezzubov] Merge branch 'master' into notebook-search
009b290 [Alexander Bezzubov] ZEPPELIN-501: muting logs back
0efc00e [Alexander Bezzubov] Merge branch 'master' into notebook-search
b0b2c54 [Alexander Bezzubov] ZEPPELIN-501: refactoring, renames + verbose logging ON
36b2467 [Alexander Bezzubov] ZEPPELIN-501: add default val for Note.name
c7ae983 [Alexander Bezzubov] Merge branch 'master' into notebook-search
ded9c3b [Alexander Bezzubov] ZEPPELIN-501: adding missing license headers
cd2173e [Alexander Bezzubov] ZEPPELIN-501: tixing fypo in docs, again 🙈
1952847 [Alexander Bezzubov] ZEPPELIN-501: minor test update
6180c86 [Alexander Bezzubov] ZEPPELIN-501: mute logs, invalid notes do not fail all indexing
29da337 [Alexander] Merge pull request apache#7 from felizbear/search-fix
c00b516 [Alexander Bezzubov] ZEPPELIN-501: update LICENCE file with new deps
5a18bc8 [Alexander Bezzubov] ZEPPELIN-501: restore NotebookRepoSync.sync() visibility + compiler warning cleanup
fcbff3d [felizbear] add missing apache license info to a source file
00f0315 [felizbear] handle notebooks is search results
7d06686 [felizbear] fix search-related bug in notebook controller
e80c3e5 [Alexander Bezzubov] ZEPPELIN-501: Indexing notebook names
b853aa6 [Alexander Bezzubov] ZEPPELIN-501: fixing typos in docs
82c7dd7 [Alexander Bezzubov] ZEPPELIN-501: reverting accidental changes
71ec51f [felizbear] clear search field on navigation to home view (/)
1e1357c [felizbear] redirect to notebook and scroll to paragraph from search view
09d44d2 [Alexander Bezzubov] Search: re-index note on every change
b2b93c4 [Alexander Bezzubov] Search: refatoring, move SearchService from NotebookRepoSync -> Notebook
08fe806 [Alexander Bezzubov] Search: adding tests
63a4e05 [Alexander Bezzubov] Search: adding search API docs
98f4e59 [Alexander Bezzubov] Search: refactoring, rename fragment -> snippet
5c1e3e4 [Alexander Bezzubov] Refatoring - removing old annotations
e363ed4 [Alexander Bezzubov] Search: make jshint happy
7aad5cf [Alexander Bezzubov] Search: make checkstyle happy
6ccd6f1 [Alexander Bezzubov] Search: nuke compiler warnings in NotebookRestApi
aa5ddb3 [felizbear] center search results on screen
227c6b4 [felizbear] update search results view: add panels for results
865925c [felizbear] highlight syntax and search terms in search results
9ca8628 [Alexander Bezzubov] Search: merge first 3 fragments + full paragraph in search result
11127f0 [felizbear] style search widget for notebook search
db246fa [Alexander Bezzubov] Search: highlighting added using fragments
c2c2a52 [Alexander Bezzubov] Search: backend indexing using Lucene added to zengine
163a465 [Alexander Bezzubov] Search: add search/result-list and switch to
bc2458a [Alexander Bezzubov] Get rid of compiler warnings
3900b60 [Alexander Bezzubov] Search: disabling UI on disconnect
7880237 [Alexander Bezzubov] Search: backend REST API scetch /notebooks/search?q=... added
c5928f9 [Alexander Bezzubov] Search: form added to navbar in frontend

docs/rest-api/rest-notebook.md

@@ -556,4 +556,33 @@ limitations under the License.
       <td><pre>{"status":"OK","body":"* * * * * ?"}</pre></td>
     </tr>
   </table>
+
+  <table class="table-configuration">
+    <col width="200">
+    <tr>
+      <th>Full-text search through the paragraphs in all notebooks</th>
+      <th></th>
+    </tr>
+    <tr>
+      <td>Description</td>
+      <td>```GET``` request will return list of matching paragraphs
+      </td>
+    </tr>
+    <tr>
+      <td>URL</td>
+      <td>```http://[zeppelin-server]:[zeppelin-port]/api/notebook/search?q=[query]```</td>
+    </tr>
+    <tr>
+      <td>Success code</td>
+      <td>200</td>
+    </tr>
+    <tr>
+      <td>Fail code</td>
+      <td> 500 </td>
+    </tr>
+    <tr>
+      <td>Sample JSON response </td>
+      <td><pre>{"status":"OK", body: [{"id":"<noteId>/paragraph/<paragraphId>", "name":"Notebook Name", "snippet":"", "text":""}]}</pre></td>
+    </tr>
+  </table>
 

zeppelin-distribution/src/bin_license/LICENSE

@@ -44,6 +44,7 @@ The following components are provided under Apache License.
     (Apache 2.0) Apache Tajo (http://tajo.apache.org/)
     (Apache 2.0) Apache Flink (http://flink.apache.org/)
     (Apache 2.0) Apache Thrift (http://thrift.apache.org/)
+    (Apache 2.0) Apache Lucene (https://lucene.apache.org/)
     (Apache 2.0) Apache Zookeeper (org.apache.zookeeper:zookeeper:jar:3.4.5 - http://zookeeper.apache.org/)
     (Apache 2.0) Chill (com.twitter:chill-java:jar:0.5.0 - https://github.com/twitter/chill/)
     (Apache 2.0) Codehaus Plexus (org.codehaus.plexus:plexus:jar:1.5.6 - https://codehaus-plexus.github.io/)
@@ -129,10 +130,10 @@ The following components are provided under the MIT License.
     (The MIT License) Objenesis (org.objenesis:objenesis:2.1 - https://github.com/easymock/objenesis) - Copyright (c) 2006-2015 the original author and authors
     (The MIT License) JCL 1.1.1 implemented over SLF4J (org.slf4j:jcl-over-slf4j:1.7.5 - http://www.slf4j.org)    
     (The MIT License) JUL to SLF4J bridge (org.slf4j:jul-to-slf4j:1.7.5 - http://www.slf4j.org)
+    (The MIT License) angular-resource (angular-resource - https://github.com/angular/angular.js/tree/master/src/ngResource)
     (The MIT License) minimal-json (com.eclipsesource.minimal-json:minimal-json:0.9.4 - https://github.com/ralfstx/minimal-json)
 
 
-
 ========================================================================
 BSD-style licenses
 ========================================================================

zeppelin-interpreter/src/main/java/org/apache/zeppelin/scheduler/Job.java

@@ -37,7 +37,6 @@
  *  and saving/loading jobs from disk.
  *  Changing/adding/deleting non transitive field name need consideration of that.
  *
- *  @author Leemoonsoo
  */
 public abstract class Job {
   /**

zeppelin-server/pom.xml

@@ -197,6 +197,22 @@
       <version>2.2.1</version>
     </dependency>
 
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-servlet</artifactId>
+      <version>1.13</version>
+    </dependency>
+
+    <dependency>
+      <groupId>javax.ws.rs</groupId>
+      <artifactId>javax.ws.rs-api</artifactId>
+      <version>2.0-m10</version>
+    </dependency>
+
+    <dependency>
+      <groupId>org.scala-lang</groupId>
+      <artifactId>scala-library</artifactId>
+    </dependency>
 
     <dependency>
       <groupId>org.seleniumhq.selenium</groupId>
@@ -240,23 +256,6 @@
       <scope>test</scope>
     </dependency>
 
-    <dependency>
-      <groupId>com.sun.jersey</groupId>
-      <artifactId>jersey-servlet</artifactId>
-      <version>1.13</version>
-    </dependency>
-
-    <dependency>
-      <groupId>javax.ws.rs</groupId>
-      <artifactId>javax.ws.rs-api</artifactId>
-      <version>2.0-m10</version>
-    </dependency>
-
-    <dependency>
-      <groupId>org.scala-lang</groupId>
-      <artifactId>scala-library</artifactId>
-    </dependency>
-
     <dependency>
       <groupId>org.scalatest</groupId>
       <artifactId>scalatest_2.10</artifactId>
@@ -268,6 +267,7 @@
       <groupId>org.mockito</groupId>
       <artifactId>mockito-all</artifactId>
       <version>1.9.0</version>
+      <scope>test</scope>
     </dependency>
   </dependencies>