Search result record abstract parsing improvement

[wangf1122]

The Search Page break down the abstract brief by line break as paragraphs. However, there is some special case some user write the format as

Description:
This is some abstract etc.

By the existing logic, search result will show very little abstract which is not clear to the user

The improved logic will make sure the abstract brief is at least 50 characters or it will keep appending the next paragraph together.

As result, the user will have more content to read.

Checklist

• I have read the contribution guidelines
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests
• User documentation provided for new features or enhancements in manual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation