Fix styling of ESSelector Selected values

Elasticsearch search components: is it possible to improve the display when a value is selected?
it is currently not very visible that the selected value belongs to the ESSelector field, it is displayed below with a x to remove it.

Good suggestion here:

https://github.com/inveniosoftware/react-invenio-app-ils/pull/193#pullrequestreview-487780795

Start by locating the Elasticsearch search components and reviewing how ESSelector renders selected values. Compare the current display with the suggestion in the linked pull-request review. Done means the selected value is visibly associated with its ESSelector field while retaining the existing removal control.

Written by the indexing model from the issue text.