Validate search string syntax

[agbeltran]

Description:
Some search strings will give a syntax error, so I was wondering if we can have more checks to validate the search string and perhaps even include suggestions on how to improve it.

E.g the search string

CAL_IMAT_12/10/2017 16:05:49

is not valid and the appropriate search can be done by adding quotes:

"CAL_IMAT_12/10/2017 16:05:49"

finding the specific investigation correctly.

Acceptance criteria:

• Investigate what improvements we can make to validate the search string and suggest alternative strings

[patrick-austin]

As part of the wider changes to Lucene, the backend should throw errors specific to bad syntax. #1363 also has some suggestions on how to make the search help more explicit on what special characters cause the problems. Fundamentally the supported syntax is determined by https://lucene.apache.org/core/8_6_0/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#package_description and this is linked from the help text.